diff --git a/assets/less/classes/forum/category.less b/assets/less/classes/forum/category.less
index ae0467d5..9706557c 100644
--- a/assets/less/classes/forum/category.less
+++ b/assets/less/classes/forum/category.less
@@ -181,7 +181,7 @@
             }
 
             @media (max-width: @site-mobile-width) {
-                flex: 1 1 auto;
+                flex: 1 0 auto;
                 text-align: left;
                 max-width: 120px;
             }