diff --git a/tools/mpremote/mpremote/main.py b/tools/mpremote/mpremote/main.py
index 50a4e334bddf..e1caee13a3c4 100644
--- a/tools/mpremote/mpremote/main.py
+++ b/tools/mpremote/mpremote/main.py
@@ -406,6 +406,8 @@ def usage_error(cmd, exp_args, msg):
         cmd = args.pop(0)
         exp_args, exp_sub, _ = _command_expansions[cmd]
         for exp_arg in exp_args:
+            if args and args[0] == "+":
+                break
             exp_arg_name = exp_arg[0]
             if args and "=" not in args[0]:
                 # Argument given without a name.