diff --git a/tests/python/cycles_render_tests.py b/tests/python/cycles_render_tests.py
index c7e12dd5b7c..1d30a696e98 100644
--- a/tests/python/cycles_render_tests.py
+++ b/tests/python/cycles_render_tests.py
@@ -85,6 +85,10 @@ def get_arguments(filepath, output_filepath):
     if custom_args:
         args.extend(shlex.split(custom_args))
 
+    spp_multiplier = os.getenv('CYCLESTEST_SPP_MULTIPLIER')
+    if spp_multiplier:
+        args.extend(["--python-expr", f"import bpy; bpy.context.scene.cycles.samples *= {spp_multiplier}"])
+
     if subject == 'bake':
         args.extend(['--python', os.path.join(basedir, "util", "render_bake.py")])
     elif subject == 'denoise_animation':