diff --git a/src/less/image.less b/src/less/image.less
index add5b1d0f..df60b8aa0 100644
--- a/src/less/image.less
+++ b/src/less/image.less
@@ -18,7 +18,7 @@
   _background: none;
 }
 
-.background(@class,@backgroundPath, @top:center, @left:center, @repeat: no-repeat) {
+.background(@class, @backgroundPath, @top:center, @left:center, @repeat: no-repeat) {
   .@{class} {
     .image2xPath(@backgroundPath, @top, @left, @repeat);