diff --git a/superset/views/core.py b/superset/views/core.py
index 802b8919887a9..85cc1c4dd412c 100755
--- a/superset/views/core.py
+++ b/superset/views/core.py
@@ -1101,7 +1101,9 @@ def filter(self, datasource_type, datasource_id, column):
         if not self.datasource_access(datasource):
             return json_error_response(DATASOURCE_ACCESS_ERR)
 
-        payload = json.dumps(datasource.values_for_column(column))
+        payload = json.dumps(
+            datasource.values_for_column(column),
+            default=utils.json_int_dttm_ser)
         return json_success(payload)
 
     def save_or_overwrite_slice(