diff --git a/kcidb/db/postgresql/v04_00.py b/kcidb/db/postgresql/v04_00.py
index 4f47724f..93b6f22b 100644
--- a/kcidb/db/postgresql/v04_00.py
+++ b/kcidb/db/postgresql/v04_00.py
@@ -147,7 +147,7 @@ def set_schema_version(self, version):
                     RETURNS integer
                     LANGUAGE SQL
                     IMMUTABLE
-                    RETURN %s
+                    AS 'SELECT %s'
                 """), (number, ))
 
     def get_schema_version(self):