diff --git a/src/newgrf_generic.h b/src/newgrf_generic.h
--- a/src/newgrf_generic.h
+++ b/src/newgrf_generic.h
@@ -51,7 +51,7 @@ uint16_t GetAiPurchaseCallbackResult(uin
 void AmbientSoundEffectCallback(TileIndex tile);
 
 /** Play an ambient sound effect for an empty tile. */
-static inline void AmbientSoundEffect(TileIndex tile)
+inline void AmbientSoundEffect(TileIndex tile)
 {
 	/* Only run callback if enabled. */
 	if (!HasGrfMiscBit(GMB_AMBIENT_SOUND_CALLBACK)) return;