diff --git a/libraries/GCS_MAVLink/GCS_Common.cpp b/libraries/GCS_MAVLink/GCS_Common.cpp
index e6318c9e2a15f2..284805a2e5faae 100644
--- a/libraries/GCS_MAVLink/GCS_Common.cpp
+++ b/libraries/GCS_MAVLink/GCS_Common.cpp
@@ -3029,6 +3029,9 @@ MAV_RESULT GCS_MAVLINK::handle_command_do_aux_function(const mavlink_command_int
 
 MAV_RESULT GCS_MAVLINK::handle_command_set_message_interval(const mavlink_command_int_t &packet)
 {
+    if (packet.param3 != 0) {
+        return MAV_RESULT_DENIED;
+    }
     return set_message_interval((uint32_t)packet.param1, (int32_t)packet.param2);
 }