diff --git a/peewee.py b/peewee.py
index 53b1793eb..9aee120f7 100644
--- a/peewee.py
+++ b/peewee.py
@@ -61,7 +61,7 @@
 try:
     from psycopg import errors as pg3_errors
 except ImportError:
-    pass
+    pg3_errors = None
 
 mysql_passwd = False
 try: