diff --git a/core-drawer-panel.css b/core-drawer-panel.css
index 5fd90e3..08c5461 100644
--- a/core-drawer-panel.css
+++ b/core-drawer-panel.css
@@ -24,7 +24,7 @@ core-selector > #drawer {
   height: 100%;
   will-change: transform;
   box-sizing: border-box;
-  -mox-box-sizing: border-box;
+  -moz-box-sizing: border-box;
 }
 
 .transition > #drawer {