diff --git a/src/snowflake/snowpark/mock/_connection.py b/src/snowflake/snowpark/mock/_connection.py
index 92fea43002..4c09e656f3 100644
--- a/src/snowflake/snowpark/mock/_connection.py
+++ b/src/snowflake/snowpark/mock/_connection.py
@@ -31,6 +31,7 @@
 from snowflake.snowpark._internal.error_message import SnowparkClientExceptionMessages
 from snowflake.snowpark._internal.server_connection import DEFAULT_STRING_SIZE
 from snowflake.snowpark._internal.utils import (
+    IS_V5_DRIVER,
     is_in_stored_procedure,
     result_set_to_rows,
 )
@@ -78,6 +79,10 @@ def connect(self, **kwargs) -> None:
         }
         self._rest = Mock(**attrs)
 
+    if IS_V5_DRIVER:
+        # UD Connection.__init__ calls _connect(); legacy called connect().
+        _connect = connect
+
     def close(self, retry: bool = True) -> None:
         self._rest = None