diff --git a/pattern.py b/pattern.py
index aa92ead..7c7ab75 100644
--- a/pattern.py
+++ b/pattern.py
@@ -51,8 +51,8 @@ def mod(target, arg, index):
     return (target % arg, index)
 
 
-def rand(target, arg):
-    return random.randrange(0, 255)
+def rand(target, arg, index):
+    return (random.randrange(0, 255), index)
 
 
 def jnz(target, arg, index):