diff --git a/src/vs/workbench/browser/parts/views/customView.ts b/src/vs/workbench/browser/parts/views/customView.ts
index 7ad330ab85ad1fba5cbdf7d1b5190317a22db4ed..212fbe26b9db9829c9df7e4aebd8502712128805 100644
--- a/src/vs/workbench/browser/parts/views/customView.ts
+++ b/src/vs/workbench/browser/parts/views/customView.ts
@@ -509,7 +509,7 @@ class TreeRenderer implements IRenderer {
 			templateData.resourceLabel.setLabel({ name: label }, { title, hideIcon: true, extraClasses: ['custom-view-tree-node-item-resourceLabel'] });
 		}
 
-		templateData.icon.style.backgroundImage = iconUrl ? `url('${iconUrl}')` : '';
+		templateData.icon.style.backgroundImage = iconUrl ? `url('${iconUrl.toString(true)}')` : '';
 		DOM.toggleClass(templateData.icon, 'custom-view-tree-node-item-icon', !!iconUrl);
 		templateData.actionBar.context = (<TreeViewItemHandleArg>{ $treeViewId: this.treeViewId, $treeItemHandle: node.handle });
 		templateData.actionBar.push(this.menus.getResourceActions(node), { icon: true, label: false });