diff --git a/libraries/AP_GPS/examples/GPS_406_test/GPS_406_test.pde b/libraries/AP_GPS/examples/GPS_406_test/GPS_406_test.pde
index 3f0958c28c..d6cfdbb116 100644
--- a/libraries/AP_GPS/examples/GPS_406_test/GPS_406_test.pde
+++ b/libraries/AP_GPS/examples/GPS_406_test/GPS_406_test.pde
@@ -8,6 +8,7 @@
 
 #include <FastSerial.h>
 #include <AP_Common.h>
+#include <AP_Math.h>
 #include <AP_GPS.h>
 
 FastSerialPort0(Serial);
diff --git a/libraries/AP_GPS/examples/GPS_NMEA_test/GPS_NMEA_test.pde b/libraries/AP_GPS/examples/GPS_NMEA_test/GPS_NMEA_test.pde
index 72fdd2ce59..d58cea2e8c 100644
--- a/libraries/AP_GPS/examples/GPS_NMEA_test/GPS_NMEA_test.pde
+++ b/libraries/AP_GPS/examples/GPS_NMEA_test/GPS_NMEA_test.pde
@@ -5,6 +5,7 @@
 
 #include <FastSerial.h>
 #include <AP_Common.h>
+#include <AP_Math.h>
 #include <AP_GPS.h>
 
 FastSerialPort0(Serial);