diff --git a/mopidy/__main__.py b/mopidy/__main__.py
index 9e1e1c94..ea1cab6b 100644
--- a/mopidy/__main__.py
+++ b/mopidy/__main__.py
@@ -70,7 +70,7 @@ def main():
 
         for data in extensions_data:
             if data.command:  # TODO: check isinstance?
-                data.command.set(extension=data.command)
+                data.command.set(extension=data.extension)
                 root_cmd.add_child(data.extension.ext_name, data.command)
 
         args = root_cmd.parse(mopidy_args)