diff --git a/src/newgrf_sound.h b/src/newgrf_sound.h
--- a/src/newgrf_sound.h
+++ b/src/newgrf_sound.h
@@ -23,9 +23,9 @@ enum VehicleSoundEvent {
 
 FileEntry *AllocateFileEntry();
 void InitializeSoundPool();
-FileEntry *GetSound(uint index);
+FileEntry *GetSound(SoundID sound_id);
 uint GetNumSounds();
 bool PlayVehicleSound(const Vehicle *v, VehicleSoundEvent event);
-bool PlayTileSound(const struct GRFFile *file, uint16 sound_id, TileIndex tile);
+bool PlayTileSound(const struct GRFFile *file, SoundID sound_id, TileIndex tile);
 
 #endif /* NEWGRF_SOUND_H */