diff --git a/contrib/mixin/mixin.libsonnet b/contrib/mixin/mixin.libsonnet
index 317a70298..ad89432b0 100644
--- a/contrib/mixin/mixin.libsonnet
+++ b/contrib/mixin/mixin.libsonnet
@@ -1381,7 +1381,7 @@
               value: 'Prometheus',
             },
             hide: 0,
-            label: null,
+            label: 'Data Source',
             name: 'datasource',
             options: [],
             query: 'prometheus',