diff --git a/public/css/icinga/mixins.less b/public/css/icinga/mixins.less
index 33c6fe022..4b8064339 100644
--- a/public/css/icinga/mixins.less
+++ b/public/css/icinga/mixins.less
@@ -42,9 +42,7 @@
 }
 
 .opacity(@opacity: 0.6) {
-  -webkit-opacity: @opacity;
-     -moz-opacity: @opacity;
-          opacity: @opacity;
+  opacity: @opacity;
 }
 
 .transform(@transform) {