diff --git a/sample.lua b/sample.lua
index 51427c5..e01cf21 100644
--- a/sample.lua
+++ b/sample.lua
@@ -3,6 +3,9 @@ if position == nil then
 	position = 0
 end
 position = position + 1
+if position > num_of_notes then
+	position = 1
+end
 mem.position = position
 
 if pin.b then