diff --git a/superset/viz.py b/superset/viz.py
index 87dd1a9ebe01c..dbfcdcc9b72f3 100644
--- a/superset/viz.py
+++ b/superset/viz.py
@@ -2019,6 +2019,7 @@ def query_obj(self):
         if fd.get('js_columns'):
             gb += fd.get('js_columns')
         metrics = self.get_metrics()
+        gb = list(set(gb))
         if metrics:
             d['groupby'] = gb
             d['metrics'] = self.get_metrics()