diff --git a/libraries/AP_NavEKF3/AP_NavEKF3_PosVelFusion.cpp b/libraries/AP_NavEKF3/AP_NavEKF3_PosVelFusion.cpp
index 43cd9e4b06..e00a1d5079 100644
--- a/libraries/AP_NavEKF3/AP_NavEKF3_PosVelFusion.cpp
+++ b/libraries/AP_NavEKF3/AP_NavEKF3_PosVelFusion.cpp
@@ -524,7 +524,7 @@ void NavEKF3_core::SelectVelPosFusion()
         }
     }
 
-    // If we are operating without any aiding, fuse in constnat position of constant
+    // If we are operating without any aiding, fuse in constant position of constant
     // velocity measurements to constrain tilt drift. This assumes a non-manoeuvring
     // vehicle. Do this to coincide with the height fusion.
     if (fuseHgtData && PV_AidingMode == AID_NONE) {