diff --git a/app/assets/stylesheets/mobile/header.scss b/app/assets/stylesheets/mobile/header.scss
index 0e43c125831..d359b2acf6f 100644
--- a/app/assets/stylesheets/mobile/header.scss
+++ b/app/assets/stylesheets/mobile/header.scss
@@ -36,6 +36,10 @@
   padding-top: 60px;
 }
 
+.unread-private-messages {
+  background-color: $success;
+}
+
 
 // Dropdowns
 // --------------------------------------------------