diff --git a/types/angular-material/angular-material-tests.ts b/types/angular-material/angular-material-tests.ts
index 06d98505ed..ad79cff2db 100644
--- a/types/angular-material/angular-material-tests.ts
+++ b/types/angular-material/angular-material-tests.ts
@@ -393,6 +393,6 @@ myApp.controller('StickyController', ($scope: TestScope, $mdSticky: ng.material.
     const stickyElement = angular.element(new Element());
     const cloneStickyElement = stickyElement.clone();
 
-    $mdSticky($scope, stickyElement);    
-    $mdSticky($scope, stickyElement, cloneStickyElement);    
-});
\ No newline at end of file
+    $mdSticky($scope, stickyElement);
+    $mdSticky($scope, stickyElement, cloneStickyElement);
+});
diff --git a/types/angular-material/index.d.ts b/types/angular-material/index.d.ts
index e9263459f1..d77f5ae7ce 100644
--- a/types/angular-material/index.d.ts
+++ b/types/angular-material/index.d.ts
@@ -495,9 +495,6 @@ declare module 'angular' {
             configure(options: IProgressCircularConfig): void;
         }
 
-        interface IStickyService {
-            (scope: IScope, element: JQuery): void;
-            (scope: IScope, element: JQuery, elementClone: JQuery): void;
-        }
+        type IStickyService = (scope: IScope, element: JQuery, elementClone?: JQuery) => void;
     }
 }