diff --git a/select2.css b/select2.css
index 4cb176bb..8d3e8ee9 100644
--- a/select2.css
+++ b/select2.css
@@ -519,7 +519,7 @@ disabled look for already selected choices in the results dropdown
 
 @media only screen and (-webkit-min-device-pixel-ratio: 1.5) {
 	.select2-search input, .select2-search-choice-close, .select2-container .select2-choice abbr, .select2-container .select2-choice div b {
-		background-image: url(select2x2.png) !important;
+		background-image: url('select2x2.png') !important;
 		background-repeat: no-repeat !important;
 		background-size: 60px 40px !important;
 	}