diff --git a/app/assets/stylesheets/desktop/topic-list.scss b/app/assets/stylesheets/desktop/topic-list.scss
index 48f0218d923..46082442841 100644
--- a/app/assets/stylesheets/desktop/topic-list.scss
+++ b/app/assets/stylesheets/desktop/topic-list.scss
@@ -211,6 +211,7 @@ button.dismiss-read {
 
 .category-heading {
   clear: both;
+  max-width: 100%;
   p {
     line-height: $line-height-large;
     font-size: $font-up-3;