diff -r 45bbe95a37b6 south/db/mysql.py
--- a/south/db/mysql.py	Tue Feb 15 11:35:39 2011 +0000
+++ b/south/db/mysql.py	Tue Feb 15 13:38:10 2011 -0600
@@ -43,8 +43,7 @@
             SELECT kc.constraint_name, kc.column_name, kc.table_name
             FROM information_schema.key_column_usage AS kc
             WHERE
-                kc.table_schema = %s AND
-                kc.table_catalog IS NULL
+                kc.table_schema = %s
         """
         rows = self.execute(name_query, [db_name])
         if not rows: