diff --git a/libraries/AP_HAL/examples/Printf/Printf.pde b/libraries/AP_HAL/examples/Printf/Printf.pde
index 3e83790987..2f18804b28 100644
--- a/libraries/AP_HAL/examples/Printf/Printf.pde
+++ b/libraries/AP_HAL/examples/Printf/Printf.pde
@@ -12,6 +12,7 @@
 #include <DataFlash.h>
 #include <GCS_MAVLink.h>
 #include <AP_Mission.h>
+#include <AP_Terrain.h>
 #include <AP_Compass.h>
 #include <AP_Declination.h>
 #include <SITL.h>
diff --git a/libraries/AP_HAL_AVR/examples/ArduCopterLibs/ArduCopterLibs.pde b/libraries/AP_HAL_AVR/examples/ArduCopterLibs/ArduCopterLibs.pde
index 0b7e9a11ae..eee4900829 100644
--- a/libraries/AP_HAL_AVR/examples/ArduCopterLibs/ArduCopterLibs.pde
+++ b/libraries/AP_HAL_AVR/examples/ArduCopterLibs/ArduCopterLibs.pde
@@ -37,6 +37,7 @@
 #include <AP_InertialNav.h>     // ArduPilot Mega inertial navigation library
 #include <GCS_MAVLink.h>
 #include <AP_Mission.h>
+#include <AP_Terrain.h>
 #include <memcheck.h>
 
 #if CONFIG_HAL_BOARD == HAL_BOARD_APM2
diff --git a/libraries/AP_HAL_AVR/examples/ArduPlaneLibs/ArduPlaneLibs.pde b/libraries/AP_HAL_AVR/examples/ArduPlaneLibs/ArduPlaneLibs.pde
index 5935f02084..7d21a9dd25 100644
--- a/libraries/AP_HAL_AVR/examples/ArduPlaneLibs/ArduPlaneLibs.pde
+++ b/libraries/AP_HAL_AVR/examples/ArduPlaneLibs/ArduPlaneLibs.pde
@@ -29,6 +29,7 @@
 #include <AP_Vehicle.h>
 #include <GCS_MAVLink.h>    // MAVLink GCS definitions
 #include <AP_Mission.h>
+#include <AP_Terrain.h>
 #include <AP_Mount.h>           // Camera/Antenna mount
 #include <AP_Declination.h> // ArduPilot Mega Declination Helper Library
 
diff --git a/libraries/AP_HAL_FLYMAPLE/examples/AP_Baro_BMP085_test/AP_Baro_BMP085_test.pde b/libraries/AP_HAL_FLYMAPLE/examples/AP_Baro_BMP085_test/AP_Baro_BMP085_test.pde
index 496900d0a4..06d75f65c7 100644
--- a/libraries/AP_HAL_FLYMAPLE/examples/AP_Baro_BMP085_test/AP_Baro_BMP085_test.pde
+++ b/libraries/AP_HAL_FLYMAPLE/examples/AP_Baro_BMP085_test/AP_Baro_BMP085_test.pde
@@ -19,6 +19,7 @@
 #include <DataFlash.h>
 #include <GCS_MAVLink.h>
 #include <AP_Mission.h>
+#include <AP_Terrain.h>
 
 #include <AP_HAL_FLYMAPLE.h>
 
diff --git a/libraries/AP_HAL_PX4/examples/simple/simple.pde b/libraries/AP_HAL_PX4/examples/simple/simple.pde
index 33c09f01d6..636b32976c 100644
--- a/libraries/AP_HAL_PX4/examples/simple/simple.pde
+++ b/libraries/AP_HAL_PX4/examples/simple/simple.pde
@@ -21,6 +21,7 @@
 #include <DataFlash.h>
 #include <GCS_MAVLink.h>
 #include <AP_Mission.h>
+#include <AP_Terrain.h>
 #include <AP_Param.h>
 #include <AP_Baro.h>
 #include <AP_Compass.h>