diff --git a/app/assets/stylesheets/mobile/topic-post.scss b/app/assets/stylesheets/mobile/topic-post.scss
index 1eaaf47b98..f295cacb6c 100644
--- a/app/assets/stylesheets/mobile/topic-post.scss
+++ b/app/assets/stylesheets/mobile/topic-post.scss
@@ -7,7 +7,7 @@
 }
 
 .topic-post {
-  border-top: 1px solid sscale-color-diff();
+  border-top: 1px solid scale-color-diff();
   padding: 6px 0 3px 0;
 }