diff --git a/thermion_dart/native/include/TSceneManager.h b/thermion_dart/native/include/TSceneManager.h
index 295df4db..923b04dd 100644
--- a/thermion_dart/native/include/TSceneManager.h
+++ b/thermion_dart/native/include/TSceneManager.h
@@ -42,11 +42,11 @@ extern "C"
 		int numFrames,
 		float frameLengthInMs);
 	
-	// SceneManager
 	EMSCRIPTEN_KEEPALIVE TCamera* SceneManager_createCamera(TSceneManager *sceneManager);
 	EMSCRIPTEN_KEEPALIVE void SceneManager_destroyCamera(TSceneManager *sceneManager, TCamera* camera);
 	EMSCRIPTEN_KEEPALIVE size_t SceneManager_getCameraCount(TSceneManager *sceneManager);	
 	EMSCRIPTEN_KEEPALIVE TCamera* SceneManager_getCameraAt(TSceneManager *sceneManager, size_t index);	
+	EMSCRIPTEN_KEEPALIVE void SceneManager_destroyMaterialInstance(TSceneManager *sceneManager, TMaterialInstance *instance);
 
 #ifdef __cplusplus
 }
diff --git a/thermion_dart/native/include/ThermionDartApi.h b/thermion_dart/native/include/ThermionDartApi.h
index 777c02ae..f7a74336 100644
--- a/thermion_dart/native/include/ThermionDartApi.h
+++ b/thermion_dart/native/include/ThermionDartApi.h
@@ -13,7 +13,7 @@ extern "C"
 #endif
 
 	EMSCRIPTEN_KEEPALIVE TViewer *Viewer_create(const void *const context, const void *const loader, void *const platform, const char *uberArchivePath);
-	EMSCRIPTEN_KEEPALIVE void destroy_filament_viewer(TViewer *viewer);
+	EMSCRIPTEN_KEEPALIVE void Viewer_destroy(TViewer *viewer);
 	EMSCRIPTEN_KEEPALIVE TSceneManager *Viewer_getSceneManager(TViewer *viewer);
 	EMSCRIPTEN_KEEPALIVE TRenderTarget* Viewer_createRenderTarget(TViewer *viewer, intptr_t texture, uint32_t width, uint32_t height);
 	EMSCRIPTEN_KEEPALIVE void Viewer_destroyRenderTarget(TViewer *viewer, TRenderTarget* tRenderTarget);
@@ -106,8 +106,6 @@ extern "C"
 	
 	EMSCRIPTEN_KEEPALIVE TMaterialInstance *create_material_instance(TSceneManager *sceneManager, TMaterialKey materialConfig);
 
-	EMSCRIPTEN_KEEPALIVE void destroy_material_instance(TSceneManager *sceneManager, TMaterialInstance *instance);
-
 	EMSCRIPTEN_KEEPALIVE void clear_morph_animation(
 		TSceneManager *sceneManager,
 		EntityId entity);
diff --git a/thermion_dart/native/src/SceneManager.cpp b/thermion_dart/native/src/SceneManager.cpp
index bda8268b..26af68f9 100644
--- a/thermion_dart/native/src/SceneManager.cpp
+++ b/thermion_dart/native/src/SceneManager.cpp
@@ -578,6 +578,7 @@ namespace thermion
             _engine->destroy(materialInstance);
         }
 
+
         // TODO - free geometry?
         _textures.clear();
         _assets.clear();
@@ -2503,8 +2504,12 @@ namespace thermion
         materialInstance->setParameter(property, filament::math::float4{value.x, value.y, value.z, value.w});
     }
 
-    void SceneManager::destroy(MaterialInstance *instance)
+    void SceneManager::destroy(filament::MaterialInstance *instance)
     {
+        auto it = std::find(_materialInstances.begin(), _materialInstances.end(), instance);
+        if(it != _materialInstances.end()) {
+            _materialInstances.erase(it);    
+        }
         _engine->destroy(instance);
     }
 
diff --git a/thermion_dart/native/src/TSceneManager.cpp b/thermion_dart/native/src/TSceneManager.cpp
index 6fc7085e..48c42c91 100644
--- a/thermion_dart/native/src/TSceneManager.cpp
+++ b/thermion_dart/native/src/TSceneManager.cpp
@@ -130,4 +130,11 @@ extern "C"
     {
         return ((SceneManager *)sceneManager)->createGeometry(vertices, static_cast<uint32_t>(numVertices), normals, static_cast<uint32_t>(numNormals), uvs, static_cast<uint32_t>(numUvs), indices, static_cast<uint32_t>(numIndices), (filament::RenderableManager::PrimitiveType)primitiveType, reinterpret_cast<MaterialInstance *>(materialInstance), keepData);
     }
+
+    EMSCRIPTEN_KEEPALIVE void SceneManager_destroyMaterialInstance(TSceneManager *sceneManager, TMaterialInstance *instance)
+    {
+        ((SceneManager *)sceneManager)->destroy(reinterpret_cast<MaterialInstance *>(instance));
+    }
+
+    
 }
\ No newline at end of file