diff --git a/src/skins/vector/css/vector-web/structures/RightPanel.css b/src/skins/vector/css/vector-web/structures/RightPanel.css
index af8517b2b..7257d8b4a 100644
--- a/src/skins/vector/css/vector-web/structures/RightPanel.css
+++ b/src/skins/vector/css/vector-web/structures/RightPanel.css
@@ -93,6 +93,8 @@ limitations under the License.
     -ms-flex-order: 2;
     -webkit-order: 2;
     order: 2;
+    flex: 1;
+    -webkit-flex: 1;
 }
 
 .mx_RightPanel_footer {