diff --git a/playground/Demo1/Math.snow b/playground/Demo1/Math.snow
index 973f7c9..bfe8605 100644
--- a/playground/Demo1/Math.snow
+++ b/playground/Demo1/Math.snow
@@ -1,8 +1,8 @@
 module: Math
     function: factorial
         parameter:
-            declare n1: int
-            declare n2: int
+            declare n1: long
+            declare n2: long
         return_type: long
         body:
            return n1+n2