diff --git a/src/vs/workbench/services/extensionResourceLoader/browser/extensionResourceLoaderService.ts b/src/vs/workbench/services/extensionResourceLoader/browser/extensionResourceLoaderService.ts
index 9876d51ab0e..5ca94588cff 100644
--- a/src/vs/workbench/services/extensionResourceLoader/browser/extensionResourceLoaderService.ts
+++ b/src/vs/workbench/services/extensionResourceLoader/browser/extensionResourceLoaderService.ts
@@ -50,6 +50,7 @@ class ExtensionResourceLoaderService implements IExtensionResourceLoaderService
 			if (this._productService.commit) {
 				requestInit.headers['X-Client-Commit'] = this._productService.commit;
 			}
+			requestInit.mode = 'cors'; /* set mode to cors so that above headers are always passed */
 		}
 
 		const response = await fetch(uri.toString(true), requestInit);