diff --git a/src/components/button/button.ts b/src/components/button/button.ts
index 2e5127c2b942..fbc43bf5791e 100644
--- a/src/components/button/button.ts
+++ b/src/components/button/button.ts
@@ -68,7 +68,7 @@ export class MdButton {
     }
   }
 
-  setKeyboardFocus($event: any) {
+  setKeyboardFocus() {
     this.isKeyboardFocused = !this.isMouseDown;
   }