diff --git a/src/xpra/server/server_base.py b/src/xpra/server/server_base.py
index 275352b5ed..7a1f92f59b 100644
--- a/src/xpra/server/server_base.py
+++ b/src/xpra/server/server_base.py
@@ -1103,7 +1103,7 @@ def debug_usage():
                 return arg_err("more than 1")
             msg = []
             for csource in sources:
-                msg.append("%s : %s" % (csource, csource.sound_control(*args[1:])))
+                msg.append("%s : %s" % (csource, csource.sound_control(*args)))
             return 0, ", ".join(msg)
         elif command=="suspend":
             for csource in sources: