diff --git a/blender_cloud/attract/__init__.py b/blender_cloud/attract/__init__.py
index 86e427f..444516b 100644
--- a/blender_cloud/attract/__init__.py
+++ b/blender_cloud/attract/__init__.py
@@ -47,6 +47,7 @@ if "bpy" in locals():
     pillar = importlib.reload(pillar)
     async_loop = importlib.reload(async_loop)
     blender = importlib.reload(blender)
+    compatibility = importlib.reload(compatibility)
 else:
     import bpy
 
@@ -54,7 +55,7 @@ else:
         from . import draw_27 as draw
     else:
         from . import draw
-    from .. import pillar, async_loop, blender
+    from .. import pillar, async_loop, blender, compatibility
 
 import bpy
 import pillarsdk
@@ -252,7 +253,7 @@ class ATTRACT_PT_tools(AttractPollMixin, Panel):
                          icon='RENDER_STILL')
 
             # Group more dangerous operations.
-            dangerous_sub = layout.split(**blender.factor(0.6), align=True)
+            dangerous_sub = layout.split(**compatibility.factor(0.6), align=True)
             dangerous_sub.operator('attract.strip_unlink',
                                    text='Unlink %s' % noun,
                                    icon='PANEL_CLOSE')
@@ -408,6 +409,7 @@ class ATTRACT_OT_shot_fetch_update(AttractOperatorMixin, Operator):
         return {'FINISHED'}
 
 
+@compatibility.convert_properties
 class ATTRACT_OT_shot_relink(AttractOperatorMixin, Operator):
     bl_idname = "attract.shot_relink"
     bl_label = "Relink With Attract"
@@ -477,6 +479,7 @@ class ATTRACT_OT_shot_open_in_browser(AttractOperatorMixin, Operator):
         return {'FINISHED'}
 
 
+@compatibility.convert_properties
 class ATTRACT_OT_shot_delete(AttractOperatorMixin, Operator):
     bl_idname = 'attract.shot_delete'
     bl_label = 'Delete Shot'
@@ -915,6 +918,7 @@ class ATTRACT_OT_copy_id_to_clipboard(AttractOperatorMixin, Operator):
         return {'FINISHED'}
 
 
+@compatibility.convert_properties
 class ATTRACT_OT_project_open_in_browser(Operator):
     bl_idname = 'attract.project_open_in_browser'
     bl_label = 'Open Project in Browser'
diff --git a/blender_cloud/blender.py b/blender_cloud/blender.py
index bef4bbf..6940323 100644
--- a/blender_cloud/blender.py
+++ b/blender_cloud/blender.py
@@ -30,7 +30,7 @@ from bpy.types import AddonPreferences, Operator, WindowManager, Scene, Property
 from bpy.props import StringProperty, EnumProperty, PointerProperty, BoolProperty, IntProperty
 import rna_prop_ui
 
-from . import pillar, async_loop, flamenco, project_specific
+from . import compatibility, pillar, async_loop, flamenco, project_specific
 from .utils import pyside_cache, redraw
 
 PILLAR_WEB_SERVER_URL = os.environ.get('BCLOUD_SERVER', 'https://cloud.blender.org/')
@@ -40,23 +40,6 @@ ADDON_NAME = 'blender_cloud'
 log = logging.getLogger(__name__)
 icons = None
 
-if bpy.app.version < (2, 80):
-    SYNC_SELECT_VERSION_ICON = 'DOTSDOWN'
-else:
-    SYNC_SELECT_VERSION_ICON = 'DOWNARROW_HLT'
-
-
-@functools.lru_cache()
-def factor(factor: float) -> dict:
-    """Construct keyword argument for UILayout.split().
-
-    On Blender 2.8 this returns {'factor': factor}, and on earlier Blenders it returns
-    {'percentage': factor}.
-    """
-    if bpy.app.version < (2, 80, 0):
-        return {'percentage': factor}
-    return {'factor': factor}
-
 
 @pyside_cache('version')
 def blender_syncable_versions(self, context):
@@ -69,6 +52,7 @@ def blender_syncable_versions(self, context):
     return [(v, v, '') for v in versions]
 
 
+@compatibility.convert_properties
 class SyncStatusProperties(PropertyGroup):
     status = EnumProperty(
         items=[
@@ -156,6 +140,7 @@ def project_extensions(project_id) -> set:
     return set(proj.get('enabled_for', ()))
 
 
+@compatibility.convert_properties
 class BlenderCloudProjectGroup(PropertyGroup):
     status = EnumProperty(
         items=[
@@ -185,6 +170,7 @@ class BlenderCloudProjectGroup(PropertyGroup):
         project_specific.handle_project_update()
 
 
+@compatibility.convert_properties
 class BlenderCloudPreferences(AddonPreferences):
     bl_idname = ADDON_NAME
 
@@ -331,7 +317,7 @@ class BlenderCloudPreferences(AddonPreferences):
         bss = context.window_manager.blender_sync_status
         bsync_box = layout.box()
         bsync_box.enabled = msg_icon != 'ERROR'
-        row = bsync_box.row().split(**factor(0.33))
+        row = bsync_box.row().split(**compatibility.factor(0.33))
         row.label(text='Blender Sync with Blender Cloud', icon_value=icon('CLOUD'))
 
         icon_for_level = {
@@ -374,7 +360,7 @@ class BlenderCloudPreferences(AddonPreferences):
         layout.enabled = bss.status in {'NONE', 'IDLE'}
 
         buttons = layout.column()
-        row_buttons = buttons.row().split(**factor(0.5))
+        row_buttons = buttons.row().split(**compatibility.factor(0.5))
         row_push = row_buttons.row()
         row_pull = row_buttons.row(align=True)
 
@@ -396,7 +382,7 @@ class BlenderCloudPreferences(AddonPreferences):
                 props.blender_version = bss.version
                 row_pull.operator('pillar.sync',
                                   text='',
-                                  icon=SYNC_SELECT_VERSION_ICON).action = 'SELECT'
+                                  icon=compatibility.SYNC_SELECT_VERSION_ICON).action = 'SELECT'
         else:
             row_pull.label(text='Cloud Sync is running.')
 
@@ -444,7 +430,7 @@ class BlenderCloudPreferences(AddonPreferences):
         header_row = flamenco_box.row(align=True)
         header_row.label(text='Flamenco:', icon_value=icon('CLOUD'))
 
-        manager_split = flamenco_box.split(**factor(0.32), align=True)
+        manager_split = flamenco_box.split(**compatibility.factor(0.32), align=True)
         manager_split.label(text='Manager:')
         manager_box = manager_split.row(align=True)
 
@@ -461,7 +447,7 @@ class BlenderCloudPreferences(AddonPreferences):
         else:
             manager_box.label(text='Fetching available managers.')
 
-        path_split = flamenco_box.split(**factor(0.32), align=True)
+        path_split = flamenco_box.split(**compatibility.factor(0.32), align=True)
         path_split.label(text='Job File Path:')
         path_box = path_split.row(align=True)
         path_box.prop(self, 'flamenco_job_file_path', text='')
@@ -469,7 +455,7 @@ class BlenderCloudPreferences(AddonPreferences):
         props.path = self.flamenco_job_file_path
 
         job_output_box = flamenco_box.column(align=True)
-        path_split = job_output_box.split(**factor(0.32), align=True)
+        path_split = job_output_box.split(**compatibility.factor(0.32), align=True)
         path_split.label(text='Job Output Path:')
         path_box = path_split.row(align=True)
         path_box.prop(self, 'flamenco_job_output_path', text='')
@@ -477,7 +463,7 @@ class BlenderCloudPreferences(AddonPreferences):
         props.path = self.flamenco_job_output_path
         job_output_box.prop(self, 'flamenco_exclude_filter')
 
-        prop_split = job_output_box.split(**factor(0.32), align=True)
+        prop_split = job_output_box.split(**compatibility.factor(0.32), align=True)
         prop_split.label(text='Strip Components:')
         prop_split.prop(self, 'flamenco_job_output_strip_components', text='')
 
@@ -561,6 +547,7 @@ class PILLAR_OT_subscribe(Operator):
         return {'FINISHED'}
 
 
+@compatibility.convert_properties
 class PILLAR_OT_project_open_in_browser(Operator):
     bl_idname = 'pillar.project_open_in_browser'
     bl_label = 'Open in Browser'
diff --git a/blender_cloud/compatibility.py b/blender_cloud/compatibility.py
new file mode 100644
index 0000000..c89cd03
--- /dev/null
+++ b/blender_cloud/compatibility.py
@@ -0,0 +1,70 @@
+"""Compatibility functions to support Blender 2.79 and 2.80+ in one code base."""
+import functools
+
+import bpy
+
+
+if bpy.app.version < (2, 80):
+    SYNC_SELECT_VERSION_ICON = 'DOTSDOWN'
+else:
+    SYNC_SELECT_VERSION_ICON = 'DOWNARROW_HLT'
+
+
+# Get references to all property definition functions in bpy.props,
+# so that they can be used to replace 'x = IntProperty()' to 'x: IntProperty()'
+# dynamically when working on Blender 2.80+
+__all_prop_funcs = {
+    getattr(bpy.props, propname)
+    for propname in dir(bpy.props)
+    if propname.endswith('Property')
+}
+
+def convert_properties(class_):
+    """Class decorator to avoid warnings in Blender 2.80+
+
+    This decorator replaces property definitions like this:
+
+        someprop = bpy.props.IntProperty()
+
+    to annotations, as introduced in Blender 2.80:
+
+        someprop: bpy.props.IntProperty()
+
+    No-op if running on Blender 2.79 or older.
+    """
+
+    if bpy.app.version < (2, 80):
+        return class_
+
+    if not hasattr(class_, '__annotations__'):
+        class_.__annotations__ = {}
+
+    attrs_to_delete = []
+    for name, value in class_.__dict__.items():
+        if not isinstance(value, tuple) or len(value) != 2:
+            continue
+
+        prop_func, kwargs = value
+        if prop_func not in __all_prop_funcs:
+            continue
+
+        # This is a property definition, replace it with annotation.
+        attrs_to_delete.append(name)
+        class_.__annotations__[name] = value
+
+    for attr_name in attrs_to_delete:
+        delattr(class_, attr_name)
+
+    return class_
+
+
+@functools.lru_cache()
+def factor(factor: float) -> dict:
+    """Construct keyword argument for UILayout.split().
+
+    On Blender 2.8 this returns {'factor': factor}, and on earlier Blenders it returns
+    {'percentage': factor}.
+    """
+    if bpy.app.version < (2, 80, 0):
+        return {'percentage': factor}
+    return {'factor': factor}
diff --git a/blender_cloud/flamenco/__init__.py b/blender_cloud/flamenco/__init__.py
index 0559ed6..4d81326 100644
--- a/blender_cloud/flamenco/__init__.py
+++ b/blender_cloud/flamenco/__init__.py
@@ -34,12 +34,13 @@ if "bpy" in locals():
         bat_interface = importlib.reload(bat_interface)
         sdk = importlib.reload(sdk)
         blender = importlib.reload(blender)
+        compatibility = importlib.reload(compatibility)
     except NameError:
         from . import bat_interface, sdk
-        from .. import blender
+        from .. import blender, compatibility
 else:
     from . import bat_interface, sdk
-    from .. import blender
+    from .. import blender, compatibility
 
 import bpy
 from bpy.types import AddonPreferences, Operator, WindowManager, Scene, PropertyGroup
@@ -138,6 +139,7 @@ def silently_quit_blender():
     bpy.ops.wm.quit_blender()
 
 
+@compatibility.convert_properties
 class FlamencoManagerGroup(PropertyGroup):
     manager = EnumProperty(
         items=available_managers,
@@ -238,6 +240,7 @@ def guess_output_file_extension(output_format: str, scene) -> str:
         return '.' + container.lower()
 
 
+@compatibility.convert_properties
 class FLAMENCO_OT_render(async_loop.AsyncModalOperatorMixin,
                          pillar.AuthenticatedPillarOperatorMixin,
                          FlamencoPollMixin,
@@ -729,6 +732,7 @@ class FLAMENCO_OT_abort(Operator, FlamencoPollMixin):
         return {'FINISHED'}
 
 
+@compatibility.convert_properties
 class FLAMENCO_OT_explore_file_path(FlamencoPollMixin,
                                     Operator):
     """Opens the Flamenco job storage path in a file explorer.
@@ -796,6 +800,7 @@ class FLAMENCO_OT_disable_output_path_override(Operator):
         return {'FINISHED'}
 
 
+@compatibility.convert_properties
 class FLAMENCO_OT_set_recommended_sample_cap(Operator):
     bl_idname = 'flamenco.set_recommended_sample_cap'
     bl_label = 'Set Recommended Maximum Sample Count'
@@ -962,7 +967,7 @@ class FLAMENCO_PT_render(bpy.types.Panel, FlamencoPollMixin):
 
         prefs = preferences()
 
-        labeled_row = layout.split(**blender.factor(0.25), align=True)
+        labeled_row = layout.split(**compatibility.factor(0.25), align=True)
         labeled_row.label(text='Manager:')
         prop_btn_row = labeled_row.row(align=True)
 
@@ -980,7 +985,7 @@ class FLAMENCO_PT_render(bpy.types.Panel, FlamencoPollMixin):
         else:
             prop_btn_row.label(text='Fetching available managers.')
 
-        labeled_row = layout.split(**blender.factor(0.25), align=True)
+        labeled_row = layout.split(**compatibility.factor(0.25), align=True)
         labeled_row.label(text='Job Type:')
         labeled_row.prop(context.scene, 'flamenco_render_job_type', text='')
 
@@ -1005,7 +1010,7 @@ class FLAMENCO_PT_render(bpy.types.Panel, FlamencoPollMixin):
             sample_count = scene_sample_count(context.scene)
             recommended_cap = sample_count // 4
 
-            split = box.split(**blender.factor(0.4))
+            split = box.split(**compatibility.factor(0.4))
             split.label(text='Total Sample Count: %d' % sample_count)
             props = split.operator('flamenco.set_recommended_sample_cap',
                                    text='Recommended Max Samples per Task: %d' % recommended_cap)
@@ -1019,7 +1024,7 @@ class FLAMENCO_PT_render(bpy.types.Panel, FlamencoPollMixin):
         else:
             box.prop(context.scene, 'flamenco_render_fchunk_size')
 
-        labeled_row = layout.split(**blender.factor(0.25), align=True)
+        labeled_row = layout.split(**compatibility.factor(0.25), align=True)
         labeled_row.label(text='Frame Range:')
         prop_btn_row = labeled_row.row(align=True)
         prop_btn_row.prop(context.scene, 'flamenco_render_frame_range', text='')
@@ -1030,7 +1035,7 @@ class FLAMENCO_PT_render(bpy.types.Panel, FlamencoPollMixin):
 
         paths_layout = layout.column(align=True)
 
-        labeled_row = paths_layout.split(**blender.factor(0.25), align=True)
+        labeled_row = paths_layout.split(**compatibility.factor(0.25), align=True)
         labeled_row.label(text='Storage:')
         prop_btn_row = labeled_row.row(align=True)
         prop_btn_row.label(text=prefs.flamenco_job_file_path)
@@ -1043,7 +1048,7 @@ class FLAMENCO_PT_render(bpy.types.Panel, FlamencoPollMixin):
             paths_layout.label(text='Unable to render with Flamenco, outside of project directory.')
             return
 
-        labeled_row = paths_layout.split(**blender.factor(0.25), align=True)
+        labeled_row = paths_layout.split(**compatibility.factor(0.25), align=True)
         labeled_row.label(text='Output:')
         prop_btn_row = labeled_row.row(align=True)
 
@@ -1062,7 +1067,7 @@ class FLAMENCO_PT_render(bpy.types.Panel, FlamencoPollMixin):
         props.path = str(render_output.parent)
 
         if context.scene.flamenco_do_override_output_path:
-            labeled_row = paths_layout.split(**blender.factor(0.25), align=True)
+            labeled_row = paths_layout.split(**compatibility.factor(0.25), align=True)
             labeled_row.label(text='Effective Output Path:')
             labeled_row.label(text=str(render_output))
 
@@ -1072,7 +1077,7 @@ class FLAMENCO_PT_render(bpy.types.Panel, FlamencoPollMixin):
         flamenco_status = context.window_manager.flamenco_status
         if flamenco_status in {'IDLE', 'ABORTED', 'DONE'}:
             if prefs.flamenco_show_quit_after_submit_button:
-                ui = layout.split(**blender.factor(0.75), align=True)
+                ui = layout.split(**compatibility.factor(0.75), align=True)
             else:
                 ui = layout
             ui.operator(FLAMENCO_OT_render.bl_idname,
diff --git a/blender_cloud/image_sharing.py b/blender_cloud/image_sharing.py
index b64cdd4..096c21b 100644
--- a/blender_cloud/image_sharing.py
+++ b/blender_cloud/image_sharing.py
@@ -25,7 +25,7 @@ import bpy
 import pillarsdk
 from pillarsdk import exceptions as sdk_exceptions
 from .pillar import pillar_call
-from . import async_loop, pillar, home_project, blender
+from . import async_loop, compatibility, pillar, home_project, blender
 
 REQUIRES_ROLES_FOR_IMAGE_SHARING = {'subscriber', 'demo'}
 IMAGE_SHARING_GROUP_NODE_NAME = 'Image sharing'
@@ -53,6 +53,7 @@ async def find_image_sharing_group_id(home_project_id, user_id):
     return share_group['_id']
 
 
+@compatibility.convert_properties
 class PILLAR_OT_image_share(pillar.PillarOperatorMixin,
                             async_loop.AsyncModalOperatorMixin,
                             bpy.types.Operator):
diff --git a/blender_cloud/settings_sync.py b/blender_cloud/settings_sync.py
index 4207c04..b678da0 100644
--- a/blender_cloud/settings_sync.py
+++ b/blender_cloud/settings_sync.py
@@ -35,7 +35,7 @@ import asyncio
 import pillarsdk
 from pillarsdk import exceptions as sdk_exceptions
 from .pillar import pillar_call
-from . import async_loop, blender, pillar, cache, blendfile, home_project
+from . import async_loop, blender, compatibility, pillar, cache, blendfile, home_project
 
 SETTINGS_FILES_TO_UPLOAD = ['userpref.blend', 'startup.blend']
 
@@ -196,6 +196,7 @@ async def available_blender_versions(home_project_id: str, user_id: str) -> list
 
 
 # noinspection PyAttributeOutsideInit
+@compatibility.convert_properties
 class PILLAR_OT_sync(pillar.PillarOperatorMixin,
                      async_loop.AsyncModalOperatorMixin,
                      bpy.types.Operator):
diff --git a/blender_cloud/texture_browser/__init__.py b/blender_cloud/texture_browser/__init__.py
index 56673b6..94994c3 100644
--- a/blender_cloud/texture_browser/__init__.py
+++ b/blender_cloud/texture_browser/__init__.py
@@ -26,7 +26,7 @@ import bpy
 import bgl
 
 import pillarsdk
-from .. import async_loop, pillar, cache, blender, utils
+from .. import async_loop, compatibility, pillar, cache, blender, utils
 from . import menu_item as menu_item_mod  # so that we can have menu items called 'menu_item'
 from . import nodes
 
@@ -648,6 +648,7 @@ class BlenderCloudBrowser(pillar.PillarOperatorMixin,
         self.scroll_offset_target = self.scroll_offset = 0
 
 
+@compatibility.convert_properties
 class PILLAR_OT_switch_hdri(pillar.PillarOperatorMixin,
                             async_loop.AsyncModalOperatorMixin,
                             bpy.types.Operator):
@@ -776,7 +777,7 @@ def _hdri_download_panel(self, current_image):
                     current_image.name)
         return
 
-    row = self.layout.row(align=True).split(**blender.factor(0.3))
+    row = self.layout.row(align=True).split(**compatibility.factor(0.3))
     row.label(text='HDRi', icon_value=blender.icon('CLOUD'))
     row.prop(current_image, 'hdri_variation', text='')
 
diff --git a/blender_cloud/utils.py b/blender_cloud/utils.py
index 523508a..c454af9 100644
--- a/blender_cloud/utils.py
+++ b/blender_cloud/utils.py
@@ -94,7 +94,10 @@ def pyside_cache(propname):
                 result = wrapped(self, context)
                 return result
             finally:
-                rna_type, rna_info = getattr(self.bl_rna, propname)
+                try:
+                    rna_type, rna_info = self.bl_rna.__annotations__[propname]
+                except AttributeError:
+                    rna_type, rna_info = getattr(self.bl_rna, propname)
                 rna_info['_cached_result'] = result
         return wrapper
     return decorator