diff --git a/app/assets/stylesheets/pages/prometheus.scss b/app/assets/stylesheets/pages/prometheus.scss
index 2138231aaed808af72593c4d2353e6e6b0fb8ca4..8133a16768714e64e3bd99bc7944fb684a99cbc7 100644
--- a/app/assets/stylesheets/pages/prometheus.scss
+++ b/app/assets/stylesheets/pages/prometheus.scss
@@ -47,6 +47,7 @@
 }
 
 .prometheus-graphs-header {
+  .monitor-environment-dropdown-header header,
   .monitor-dashboard-dropdown-header header {
     font-size: $gl-font-size;
   }