diff --git a/superset/viz.py b/superset/viz.py
index 6778c3511ea05..19ff165e26a15 100755
--- a/superset/viz.py
+++ b/superset/viz.py
@@ -353,6 +353,12 @@ def get_data(self, df):
             columns=list(df.columns),
         )
 
+    def json_dumps(self, obj):
+        if self.form_data.get('all_columns'):
+            return json.dumps(obj, default=utils.json_iso_dttm_ser)
+        else:
+            return super(TableViz, self).json_dumps(obj)
+
 
 class PivotTableViz(BaseViz):