diff --git a/types/gapi.auth2/gapi.auth2-tests.ts b/types/gapi.auth2/gapi.auth2-tests.ts
index 16818e414e..1fc03f7f4f 100644
--- a/types/gapi.auth2/gapi.auth2-tests.ts
+++ b/types/gapi.auth2/gapi.auth2-tests.ts
@@ -55,8 +55,8 @@ function test_render() {
   const success = (googleUser: gapi.auth2.GoogleUser): void => {
     console.log(googleUser);
   };
-  const failure = (): void => {
-    console.log('Failure callback');
+  const failure = (reason: { error: string }): void => {
+    console.log(`Failure callback: ${reason.error}`);
   };
 
   gapi.signin2.render('testId', {
diff --git a/types/gapi.auth2/index.d.ts b/types/gapi.auth2/index.d.ts
index fdb4c08cc3..bd40ce9650 100644
--- a/types/gapi.auth2/index.d.ts
+++ b/types/gapi.auth2/index.d.ts
@@ -349,7 +349,7 @@ declare namespace gapi.signin2 {
     /**
      * The callback function to call when sign-in fails (default: none).
      */
-    onfailure?(): void;
+    onfailure?(reason: { error: string }): void;
 
     /**
      * The package name of the Android app to install over the air. See