diff --git a/tests/test_postgresql.py b/tests/test_postgresql.py
index 683e4c6693a4f73ed6a45ea7b141bc5a1bc3e413..8206300a0fea9aff209d434c4b35eceab5b3f43e 100755
--- a/tests/test_postgresql.py
+++ b/tests/test_postgresql.py
@@ -229,7 +229,7 @@ def check_psql(db_conn: dict, query: str) -> tuple:
     except subprocess.CalledProcessError as psql_error:
         return False, str(psql_error).rstrip()
 
-    return True, "OK"
+    return True, None
 
 
 def check_replication(primary: dict, standby: dict) -> tuple: