diff --git a/extensions/json/server/src/jsonServerMain.ts b/extensions/json/server/src/jsonServerMain.ts
index 6d9b700648c..f9202a9cd6f 100644
--- a/extensions/json/server/src/jsonServerMain.ts
+++ b/extensions/json/server/src/jsonServerMain.ts
@@ -102,7 +102,7 @@ let schemaRequestService = (uri:string): Thenable<string> => {
 	return xhr({ url: uri, followRedirects: 5 }).then(response => {
 		return response.responseText;
 	}, (error: XHRResponse) => {
-		return error.responseText || getErrorStatusDescription(error.status) || error.toString();
+		return Promise.reject(error.responseText || getErrorStatusDescription(error.status) || error.toString());
 	});
 };