diff --git a/app/assets/stylesheets/mobile/topic-list.scss b/app/assets/stylesheets/mobile/topic-list.scss
index f9de753246f..1ae24f4ef50 100644
--- a/app/assets/stylesheets/mobile/topic-list.scss
+++ b/app/assets/stylesheets/mobile/topic-list.scss
@@ -78,8 +78,8 @@
 // --------------------------------------------------
 
 tr.category-topic-link {
-  border-top: darken($secondary, 3%);
-  border-bottom: darken($secondary, 3%);
+  border-top: darken($secondary, 3%) 1px solid;
+  border-bottom: darken($secondary, 3%) 1px solid;
 }
 
 .topic-list.categories {