diff --git a/swfobject/swfobject.d.ts b/swfobject/swfobject.d.ts
index 7128e269e..7f59321f5 100644
--- a/swfobject/swfobject.d.ts
+++ b/swfobject/swfobject.d.ts
@@ -46,7 +46,7 @@ declare module swfobject {
 
     hasFlashPlayerVersion(
       rv: string
-    ): void;
+    ): boolean;
 
     createSWF(
       attObj: ISwfObjectAttribute,