diff --git a/src/jtag/drivers/ftdi.c b/src/jtag/drivers/ftdi.c
index 7175925e4..da5911ac9 100644
--- a/src/jtag/drivers/ftdi.c
+++ b/src/jtag/drivers/ftdi.c
@@ -837,7 +837,7 @@ COMMAND_HANDLER(ftdi_handle_set_signal_command)
 		/* fallthrough */
 	default:
 		LOG_ERROR("unknown signal level '%s', use 0, 1 or z", CMD_ARGV[1]);
-		return ERROR_COMMAND_SYNTAX_ERROR;
+		return ERROR_COMMAND_ARGUMENT_INVALID;
 	}
 
 	return mpsse_flush(mpsse_ctx);