diff --git a/dddp/__init__.py b/dddp/__init__.py
index 43f52f0..b031b85 100644
--- a/dddp/__init__.py
+++ b/dddp/__init__.py
@@ -25,12 +25,10 @@ def greenify():
 
     from gevent.monkey import patch_all, saved
     if ('threading' in sys.modules) and ('threading' not in saved):
-        raise Exception('threading module loaded before patching!')
+        import warnings
+        warnings.warn('threading module loaded before patching!')
     patch_all()
 
-    from psycogreen.gevent import patch_psycopg
-    patch_psycopg()
-
     try:
         # Use psycopg2 by default
         import psycopg2
@@ -40,6 +38,9 @@ def greenify():
         from psycopg2cffi import compat
         compat.register()
 
+    from psycogreen.gevent import patch_psycopg
+    patch_psycopg()
+
 
 class AlreadyRegistered(Exception):