diff --git a/src/main.py b/src/main.py
index 0698c75..b1e583a 100644
--- a/src/main.py
+++ b/src/main.py
@@ -9,7 +9,7 @@ class Pin:
         self.num = num
         self.off = off
 
-    def setup():
+    def setup(self):
         io.setup(self.pin, io.OUT)
 
     def off(self):