diff --git a/script/local.py b/script/local.py
index 5fba8b3..4547979 100644
--- a/script/local.py
+++ b/script/local.py
@@ -7,7 +7,7 @@ class PicoAmp(DeviceBase):
         DeviceBase.__init__(self, name)
         self.prefix = prefix
 
-    def do_something():
+    def do_something(self):
         print "OK"