diff --git a/angularjs/angular-animate.d.ts b/angularjs/angular-animate.d.ts
index e3801218b..8bdb6500e 100644
--- a/angularjs/angular-animate.d.ts
+++ b/angularjs/angular-animate.d.ts
@@ -89,7 +89,7 @@ declare module ng.animate {
         /**
          * Cancels the provided animation.
          */
-        cancel(animationPromise: ng.IPromise<void>);
+        cancel(animationPromise: ng.IPromise<void>): void;
     }
 
     ///////////////////////////////////////////////////////////////////////////