diff --git a/pillar/__init__.py b/pillar/__init__.py
index 1973df82..77c46173 100644
--- a/pillar/__init__.py
+++ b/pillar/__init__.py
@@ -284,6 +284,10 @@ class PillarServer(Eve):
         web.setup_app(self)
         authentication.setup_app(self)
 
+        for ext in self.pillar_extensions.itervalues():
+            self.log.info('Setting up extension %s', ext.name)
+            ext.setup_app(self)
+
         self._config_jinja_env()
         self._config_static_dirs()
 
diff --git a/pillar/extension.py b/pillar/extension.py
index 22b8c759..0c7b3e3a 100644
--- a/pillar/extension.py
+++ b/pillar/extension.py
@@ -62,3 +62,6 @@ class PillarExtension(object):
 
         :rtype: dict
         """
+
+    def setup_app(self, app):
+        """Called during app startup, after all extensions have loaded."""