diff --git a/app/assets/stylesheets/zammad.scss b/app/assets/stylesheets/zammad.scss
index f1aceef39..9dc607cf2 100644
--- a/app/assets/stylesheets/zammad.scss
+++ b/app/assets/stylesheets/zammad.scss
@@ -3933,7 +3933,7 @@ footer {
   }
 
 .shortcut {
-  zIndex: 1000;
+  z-index: 1000;
 }
 
 .shortcut .dropdown-menu > .active > a {