diff --git a/libraries/GCS_MAVLink/GCS_Common.cpp b/libraries/GCS_MAVLink/GCS_Common.cpp
index 41edb3152ae36..ef3f8d471e5df 100644
--- a/libraries/GCS_MAVLink/GCS_Common.cpp
+++ b/libraries/GCS_MAVLink/GCS_Common.cpp
@@ -3127,7 +3127,7 @@ MAV_RESULT GCS_MAVLINK::set_message_interval(uint32_t msg_id, int32_t interval_u
             // at.
             interval_ms = 0;
         }
-    } else if (interval_us == -1) {
+    } else if (interval_us < 0) {
         // minus-one is "stop sending"
         interval_ms = 0;
     } else if (interval_us < 1000) {