diff --git a/thermion_dart/native/include/c_api/TMaterialInstance.h b/thermion_dart/native/include/c_api/TMaterialInstance.h
index 50d50809..f348a4f2 100644
--- a/thermion_dart/native/include/c_api/TMaterialInstance.h
+++ b/thermion_dart/native/include/c_api/TMaterialInstance.h
@@ -52,6 +52,7 @@ extern "C"
 		CULLING_MODE_FRONT_AND_BACK
 	};
 
+	EMSCRIPTEN_KEEPALIVE TMaterialInstance *Material_createInstance(TMaterial *tMaterial);
 	EMSCRIPTEN_KEEPALIVE bool MaterialInstance_isStencilWriteEnabled(TMaterialInstance *materialInstance);
 	EMSCRIPTEN_KEEPALIVE void MaterialInstance_setStencilWrite(TMaterialInstance *materialInstance, bool enabled);
 	EMSCRIPTEN_KEEPALIVE void MaterialInstance_setCullingMode(TMaterialInstance *materialInstance, TCullingMode culling);