diff --git a/twistedcaldav/static.py b/twistedcaldav/static.py
index 9c6345c4c..b41202da7 100644
--- a/twistedcaldav/static.py
+++ b/twistedcaldav/static.py
@@ -411,6 +411,9 @@ def provisionFile(self):
 
         if hasattr(self, "parent"):
             parent = self.parent
+            if not parent.exists() and isinstance(parent, AutoProvisioningFileMixIn):
+                parent.provision()
+                
             assert parent.exists(), "Parent %s of %s does not exist" % (parent, self)
             assert parent.isCollection(), "Parent %s of %s is not a collection" % (parent, self)