diff --git a/modules/forums/client/less/forum.less b/modules/forums/client/less/forum.less
index 20c25995..6761ac94 100644
--- a/modules/forums/client/less/forum.less
+++ b/modules/forums/client/less/forum.less
@@ -263,12 +263,12 @@
 
     -webkit-box-orient: horizontal;
     -moz-box-orient: horizontal;
-    -ms-box-orient: horizontal;
+    -ms-flex-direction: row;
     box-orient: horizontal;
     @media (max-width: @screen-sm-max) {
         -webkit-box-orient: vertical;
         -moz-box-orient: vertical;
-        -ms-box-orient: vertical;
+        -ms-flex-direction: column;
         box-orient: vertical;
     }
     .box-uib {