diff --git a/superset/assets/javascripts/SqlLab/components/VisualizeModal.jsx b/superset/assets/javascripts/SqlLab/components/VisualizeModal.jsx
index 64d3f94f1e6..7a4edf4c353 100644
--- a/superset/assets/javascripts/SqlLab/components/VisualizeModal.jsx
+++ b/superset/assets/javascripts/SqlLab/components/VisualizeModal.jsx
@@ -146,7 +146,7 @@ class VisualizeModal extends React.PureComponent {
           formData.metric = mainMetric.name;
         }
         if (mainGroupBy) {
-          formData.groupby = mainGroupBy.name;
+          formData.groupby = [mainGroupBy.name];
         }
         window.open(getExploreUrl(formData));
       },