diff --git a/skins/base/css/organisms/LeftPanel.css b/skins/base/css/organisms/LeftPanel.css
index f384dd8f..5a466256 100644
--- a/skins/base/css/organisms/LeftPanel.css
+++ b/skins/base/css/organisms/LeftPanel.css
@@ -40,7 +40,7 @@ limitations under the License.
     order: 1;
 
     overflow-y: scroll;
-    flex: 1;
+    flex: 1 1 0;
 }
 
 .mx_LeftPanel .mx_BottomLeftMenu {