diff --git a/src/comm/QGCXPlaneLink.cc b/src/comm/QGCXPlaneLink.cc
index 247e7efa29913fc8aa726b76386aaad02b47faa2..ea5c8f8148f4f7142f6c6e584b6f16ba784f5e54 100644
--- a/src/comm/QGCXPlaneLink.cc
+++ b/src/comm/QGCXPlaneLink.cc
@@ -635,9 +635,10 @@ void QGCXPlaneLink::readBytes()
 
             if (p.index == 3)
             {
-                ind_airspeed = p.f[5] * 0.44704f;
-                true_airspeed = p.f[6] * 0.44704f;
-                groundspeed = p.f[7] * 0.44704;
+                float knotsToMetersPerSecond = 0.514444f;
+                ind_airspeed = p.f[5] * knotsToMetersPerSecond;
+                true_airspeed = p.f[6] * knotsToMetersPerSecond;
+                groundspeed = p.f[7] * knotsToMetersPerSecond;
 
                 //qDebug() << "SPEEDS:" << "airspeed" << airspeed << "m/s, groundspeed" << groundspeed << "m/s";
             }