diff --git a/server/camlistored/ui/blob_item.css b/server/camlistored/ui/blob_item.css
index bc72b7290..c9bb571ae 100644
--- a/server/camlistored/ui/blob_item.css
+++ b/server/camlistored/ui/blob_item.css
@@ -59,7 +59,7 @@
 
 .cam-blobitem .checkmark {
   background-image: url('checkmark-black-25.png');
-  background-size: 100% 100%;
+  background-repeat: no-repeat;
   cursor: pointer;
   height: 25px;
   left: 5px;