diff --git a/Tools/CPUInfo/CPUInfo.pde b/Tools/CPUInfo/CPUInfo.pde
index a91979e412..aba8100679 100644
--- a/Tools/CPUInfo/CPUInfo.pde
+++ b/Tools/CPUInfo/CPUInfo.pde
@@ -26,6 +26,7 @@
 #include <AP_Progmem.h>
 #include <AP_Math.h>
 #include <AP_AHRS.h>
+#include <AP_NavEKF.h>
 #include <AP_Airspeed.h>
 #include <AP_Vehicle.h>
 #include <AP_ADC_AnalogSource.h>