1 files changed, 7 insertions, 3 deletions
diff --git a/lib/sqlalchemy/dialects/mssql/adodbapi.py b/lib/sqlalchemy/dialects/mssql/adodbapi.py
index 6ca1879d6..9e12a944d 100644
--- a/lib/sqlalchemy/dialects/mssql/adodbapi.py
+++ b/lib/sqlalchemy/dialects/mssql/adodbapi.py
@@ -1,4 +1,4 @@
-from sqlalchemy import types as sqltypes
+from sqlalchemy import types as sqltypes, util
 from sqlalchemy.dialects.mssql.base import MSDateTime, MSDialect
 import sys
 
@@ -25,8 +25,12 @@ class MSDialect_adodbapi(MSDialect):
         import adodbapi as module
         return module
 
-    colspecs = MSDialect.colspecs.copy()
-    colspecs[sqltypes.DateTime] = MSDateTime_adodbapi
+    colspecs = util.update_copy(
+        MSDialect.colspecs,
+        {
+            sqltypes.DateTime:MSDateTime_adodbapi
+        }
+    )
 
     def create_connect_args(self, url):
         keys = url.query