diff --git a/src/skins/vector/css/vector-web/structures/RightPanel.css b/src/skins/vector/css/vector-web/structures/RightPanel.css
index 537fef4089..5da4c4ab1a 100644
--- a/src/skins/vector/css/vector-web/structures/RightPanel.css
+++ b/src/skins/vector/css/vector-web/structures/RightPanel.css
@@ -86,8 +86,8 @@ limitations under the License.
     -ms-flex-order: 2;
     -webkit-order: 2;
     order: 2;
-    flex: 1;
-    -webkit-flex: 1;
+    flex: 1 1 0;
+    -webkit-flex: 1 1 0;
 }
 
 .mx_RightPanel_footer {