diff --git a/src/vs/workbench/contrib/webview/common/resourceLoader.ts b/src/vs/workbench/contrib/webview/common/resourceLoader.ts
index e34d1ec28bd..68d4c606728 100644
--- a/src/vs/workbench/contrib/webview/common/resourceLoader.ts
+++ b/src/vs/workbench/contrib/webview/common/resourceLoader.ts
@@ -104,5 +104,5 @@ function containsResource(root: URI, resource: URI): boolean {
 		resourceFsPath = resourceFsPath.toLowerCase();
 	}
 
-	return startsWith(resource.fsPath, rootPath);
+	return startsWith(resourceFsPath, rootPath);
 }