diff --git a/src/snowflake/sqlalchemy/snowdialect.py b/src/snowflake/sqlalchemy/snowdialect.py
index 04305a00..5cb97b55 100644
--- a/src/snowflake/sqlalchemy/snowdialect.py
+++ b/src/snowflake/sqlalchemy/snowdialect.py
@@ -578,7 +578,7 @@ def _get_schema_columns(self, connection, schema, **kw):
                 sa_util.warn(
                     f"Did not recognize type '{coltype}' of column '{column_name}'"
                 )
-                col_type = sqltypes.NULLTYPE
+                col_type = sqltypes.NullType
             else:
                 if issubclass(col_type, FLOAT):
                     col_type_kw["precision"] = numeric_precision