diff --git a/deploy/grafana/dashboards/nginx.yaml b/deploy/grafana/dashboards/nginx.yaml
index 309e34e54..9623e3b34 100644
--- a/deploy/grafana/dashboards/nginx.yaml
+++ b/deploy/grafana/dashboards/nginx.yaml
@@ -593,7 +593,7 @@
       "bars": false,
       "dashLength": 10,
       "dashes": false,
-      "datasource": null,
+      "datasource": "${DS_PROMETHEUS}",
       "decimals": 2,
       "editable": false,
       "error": false,