diff --git a/less/lib/forms.less b/less/lib/forms.less
index 4d480e528..dfcb61e7b 100644
--- a/less/lib/forms.less
+++ b/less/lib/forms.less
@@ -67,6 +67,7 @@ legend {
   display: inline-block;
   width: auto;
   -webkit-appearance: none;
+  -moz-appearance: none;
   padding-right: @padding-base-horizontal + 16;
   cursor: pointer;
 }