diff --git a/less/mixins.less b/less/mixins.less
index 9204d8cde7..f6cde1966d 100644
--- a/less/mixins.less
+++ b/less/mixins.less
@@ -248,7 +248,7 @@
 }
 
 // Drop shadows
-.box-shadow(@shadow){
+.box-shadow(@shadow) {
   -webkit-box-shadow: @shadow;
      -moz-box-shadow: @shadow;
           box-shadow: @shadow;