diff --git a/src/webui/static/app/ext.css b/src/webui/static/app/ext.css
index 4f801598..f9253d91 100644
--- a/src/webui/static/app/ext.css
+++ b/src/webui/static/app/ext.css
@@ -74,7 +74,7 @@
 }
 
 .x-tree-node-leaf .x-tree-node-icon {
-    background-image:url(../icons/tv_cards.gif);
+    background-image: url(../icons/tv_cards.png);
 }
 
 .ux-mselect {