diff --git a/playground/Math.snow b/playground/Math.snow
index e79d078..161b7b2 100644
--- a/playground/Math.snow
+++ b/playground/Math.snow
@@ -2,7 +2,7 @@ module: Math
     function: factorial
         parameter:
             declare n1: long
-            declare n2: int
+            declare n2: long
         return_type: long
         body:
            return n1+n2