diff --git a/singer_sdk/streams/sql.py b/singer_sdk/streams/sql.py
index 83c808cb7..114c01674 100644
--- a/singer_sdk/streams/sql.py
+++ b/singer_sdk/streams/sql.py
@@ -873,7 +873,7 @@ def _adapt_column_type(
         if not self.allow_column_alter:
             raise NotImplementedError(
                 "Altering columns is not supported. "
-                f"Could not convert column '{full_table_name}.column_name' "
+                f"Could not convert column '{full_table_name}.{column_name}' "
                 f"from '{current_type}' to '{compatible_sql_type}'."
             )