diff --git a/libraries/AP_Terrain/AP_Terrain.h b/libraries/AP_Terrain/AP_Terrain.h
index 0d907c5839..2321ba1350 100644
--- a/libraries/AP_Terrain/AP_Terrain.h
+++ b/libraries/AP_Terrain/AP_Terrain.h
@@ -18,11 +18,7 @@
 #include <AP_Filesystem/AP_Filesystem_config.h>
 
 #ifndef AP_TERRAIN_AVAILABLE
-#if AP_FILESYSTEM_FILE_READING_ENABLED && defined(HAL_BOARD_TERRAIN_DIRECTORY)
-#define AP_TERRAIN_AVAILABLE 1
-#else
-#define AP_TERRAIN_AVAILABLE 0
-#endif
+#define AP_TERRAIN_AVAILABLE AP_FILESYSTEM_FILE_READING_ENABLED
 #endif
 
 #if AP_TERRAIN_AVAILABLE