diff --git a/libraries/AP_NavEKF2/AP_NavEKF2_MagFusion.cpp b/libraries/AP_NavEKF2/AP_NavEKF2_MagFusion.cpp
index 58cabf0e15..22ec887eb3 100644
--- a/libraries/AP_NavEKF2/AP_NavEKF2_MagFusion.cpp
+++ b/libraries/AP_NavEKF2/AP_NavEKF2_MagFusion.cpp
@@ -589,7 +589,7 @@ void NavEKF2_core::FuseMagnetometer()
     ForceSymmetry();
     ConstrainVariances();
 
-    hal.util->perf_end(_perf_test[4]);
+    hal.util->perf_end(_perf_test[5]);
 
 }