diff --git a/app/assets/stylesheets/mobile/topic.scss b/app/assets/stylesheets/mobile/topic.scss
index 7982d9a0e6e..7f9f581cd92 100644
--- a/app/assets/stylesheets/mobile/topic.scss
+++ b/app/assets/stylesheets/mobile/topic.scss
@@ -65,7 +65,7 @@
   border: 1px solid scale-color-diff();
   padding: 5px;
   background: $secondary;
-  box-shadow(0 0px 2px rgba(0,0,0, .2));
+  box-shadow: 0 0px 2px rgba(0,0,0, .2);
 
   position: absolute;
   bottom: 34px;