diff --git a/res/css/views/rooms/_RoomList.scss b/res/css/views/rooms/_RoomList.scss
index 30a569d41f..8f78e3bb7a 100644
--- a/res/css/views/rooms/_RoomList.scss
+++ b/res/css/views/rooms/_RoomList.scss
@@ -24,6 +24,10 @@ limitations under the License.
     min-height: 0;
 }
 
+.mx_SearchBox {
+    flex: none;
+}
+
 /* hide resize handles next to collapsed / empty sublists */
 .mx_RoomList .mx_RoomSubList:not(.mx_RoomSubList_nonEmpty) + .mx_ResizeHandle  {
     display: none;