diff --git a/public/app/features/panel/metrics_panel_ctrl.ts b/public/app/features/panel/metrics_panel_ctrl.ts
index 2a72ef4b24e..4d0fddf58ec 100644
--- a/public/app/features/panel/metrics_panel_ctrl.ts
+++ b/public/app/features/panel/metrics_panel_ctrl.ts
@@ -183,7 +183,7 @@ class MetricsPanelCtrl extends PanelCtrl {
     };
 
     metricsQuery.targets.forEach(function(target) {
-      target.exprID = target.expr + target.refId + metricsQuery.panelId;
+      target.exprID = target.refId + metricsQuery.panelId;
     });
 
     return datasource.query(metricsQuery);