diff --git a/types/angular-material/index.d.ts b/types/angular-material/index.d.ts
index 6b012d5677..444e043210 100644
--- a/types/angular-material/index.d.ts
+++ b/types/angular-material/index.d.ts
@@ -512,5 +512,10 @@ declare module 'angular' {
         }
 
         type IStickyService = (scope: IScope, element: JQuery, elementClone?: JQuery) => void;
+
+        interface IInteractionService {
+            getLastInteractionType(): string|null;
+            isUserInvoked(checkDelay?: number): boolean;
+        }
     }
 }