Index: django/db/backends/postgresql/operations.py
===================================================================
--- django/db/backends/postgresql/operations.py	(revision 6685)
+++ django/db/backends/postgresql/operations.py	(working copy)
@@ -27,6 +27,11 @@
     def deferrable_sql(self):
         return " DEFERRABLE INITIALLY DEFERRED"
 
+    def field_cast_sql(self, db_type):
+        if db_type == 'inet':
+            return 'CAST(%s AS TEXT)'
+        return '%s'
+
     def last_insert_id(self, cursor, table_name, pk_name):
         cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
         return cursor.fetchone()[0]