diff --git a/thermion_dart/native/include/c_api/APIBoundaryTypes.h b/thermion_dart/native/include/c_api/APIBoundaryTypes.h
index 85650a25..8073f9f2 100644
--- a/thermion_dart/native/include/c_api/APIBoundaryTypes.h
+++ b/thermion_dart/native/include/c_api/APIBoundaryTypes.h
@@ -23,6 +23,7 @@ extern "C"
 	typedef struct TCollisionComponentManager TCollisionComponentManager;
 	typedef struct TSceneAsset TSceneAsset;
 	typedef struct TNameComponentManager TNameComponentManager;
+	typedef struct TMaterial TMaterial;
 	typedef struct TMaterialInstance TMaterialInstance;
 	typedef struct TMaterialProvider TMaterialProvider;
 	typedef struct TRenderableManager TRenderableManager;