diff --git a/superset-frontend/src/datasource/DatasourceEditor.jsx b/superset-frontend/src/datasource/DatasourceEditor.jsx
index e11b8310bb75..98f82f41e4b4 100644
--- a/superset-frontend/src/datasource/DatasourceEditor.jsx
+++ b/superset-frontend/src/datasource/DatasourceEditor.jsx
@@ -464,13 +464,13 @@ class DatasourceEditor extends React.PureComponent {
         results.added.push(col.name);
       } else if (
         currentCol.type !== col.type ||
-        currentCol.is_dttm !== col.is_dttm
+        (!currentCol.is_dttm && col.is_dttm)
       ) {
         // modified column
         finalColumns.push({
           ...currentCol,
           type: col.type,
-          is_dttm: col.is_dttm,
+          is_dttm: currentCol.is_dttm || col.is_dttm,
         });
         results.modified.push(col.name);
       } else {