diff --git a/sim/fakes/bl00mbox.py b/sim/fakes/bl00mbox.py
index 4664cf7cd2b42729ba1e589ae46d547bac062c13..f44522fd4b1e01650229d86bf030e3f69f515d1d 100644
--- a/sim/fakes/bl00mbox.py
+++ b/sim/fakes/bl00mbox.py
@@ -31,3 +31,7 @@ class tinysynth:
 
     def stop(self):
         pass
+
+class Channel:
+    def __init__(self, id):
+        pass