diff --git a/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde b/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde
index 5b277882b3..5a081eb740 100644
--- a/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde
+++ b/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde
@@ -23,6 +23,7 @@
 #include <AC_PID.h>             // PID library
 #include <APM_PI.h>             // PID library
 #include <AP_Buffer.h>          // ArduPilot general purpose FIFO buffer
+#include <DataFlash.h>
 #include <GCS_MAVLink.h>
 #include <AP_Notify.h>