diff --git a/jquery.placeholder/jquery.placeholder.d.ts b/jquery.placeholder/jquery.placeholder.d.ts
index 2b4d410a7..b9af72494 100644
--- a/jquery.placeholder/jquery.placeholder.d.ts
+++ b/jquery.placeholder/jquery.placeholder.d.ts
@@ -7,7 +7,7 @@
 
 interface JQuery {
 
-	placeholder();
+	placeholder() : void;
 
 }