diff --git a/ArduCopter/GCS_Mavlink.pde b/ArduCopter/GCS_Mavlink.pde
index af5339a0e9..787b034e01 100644
--- a/ArduCopter/GCS_Mavlink.pde
+++ b/ArduCopter/GCS_Mavlink.pde
@@ -745,7 +745,7 @@ bool GCS_MAVLINK::stream_trigger(enum streams stream_num)
         if (rate > 50) {
             rate = 50;
         }
-        stream_ticks[stream_num] = (50 / rate) + stream_slowdown;
+        stream_ticks[stream_num] = (50 / rate) - 1 + stream_slowdown;
         return true;
     }