diff --git a/libraries/AC_PID/examples/AC_PID_test/AC_PID_test.pde b/libraries/AC_PID/examples/AC_PID_test/AC_PID_test.pde
index 837cd72c55..9bae64e778 100644
--- a/libraries/AC_PID/examples/AC_PID_test/AC_PID_test.pde
+++ b/libraries/AC_PID/examples/AC_PID_test/AC_PID_test.pde
@@ -9,6 +9,7 @@
 #include <AP_HAL_AVR.h>
 #include <AP_Math.h>
 #include <AP_Param.h>
+#include <StorageManager.h>
 #include <AC_PID.h>
 #include <AC_HELI_PID.h>