diff --git a/framework/core/less/forum/HeaderList.less b/framework/core/less/forum/HeaderList.less
index 79adc904c..1741d51a0 100644
--- a/framework/core/less/forum/HeaderList.less
+++ b/framework/core/less/forum/HeaderList.less
@@ -169,6 +169,7 @@
   row-gap: 1px;
   column-gap: 6px;
   cursor: pointer;
+  width: 100%;
 
   // Prevent outline overflowing parent
   .add-keyboard-focus-ring-offset(-1px);