diff --git a/src/telemetry.c b/src/telemetry.c
index 0e92ecb222..1ab9cabd37 100644
--- a/src/telemetry.c
+++ b/src/telemetry.c
@@ -96,7 +96,7 @@ static void sendBaro(void)
     sendDataHead(ID_ALTITUDE_BP);
     serialize16(BaroAlt / 100);
     sendDataHead(ID_ALTITUDE_AP);
-    serialize16(BaroAlt % 100);
+    serialize16(abs(BaroAlt % 100));
 }
 
 static void sendTemperature1(void)