diff --git a/apps/drivers/px4io/px4io.cpp b/apps/drivers/px4io/px4io.cpp
index f2c87473c4..bf23c3937c 100644
--- a/apps/drivers/px4io/px4io.cpp
+++ b/apps/drivers/px4io/px4io.cpp
@@ -500,7 +500,8 @@ PX4IO::io_send()
 
 	// XXX relays
 
-	cmd.arm_ok = _armed.armed;
+	/* armed and not locked down */
+	cmd.arm_ok = (_armed.armed && !_armed.lockdown);
 
 	ret = hx_stream_send(_io_stream, &cmd, sizeof(cmd));
 	if (ret)