diff --git a/libs/renderengine/threaded/RenderEngineThreaded.cpp b/libs/renderengine/threaded/RenderEngineThreaded.cpp
index 203bb54..b41e843 100644
--- a/libs/renderengine/threaded/RenderEngineThreaded.cpp
+++ b/libs/renderengine/threaded/RenderEngineThreaded.cpp
@@ -313,21 +313,21 @@
 }
 
 void RenderEngineThreaded::drawLayersInternal(
-        const std::shared_ptr<std::promise<RenderEngineResult>>&& resultPromise,
+        const std::shared_ptr<std::promise<FenceResult>>&& resultPromise,
         const DisplaySettings& display, const std::vector<LayerSettings>& layers,
         const std::shared_ptr<ExternalTexture>& buffer, const bool useFramebufferCache,
         base::unique_fd&& bufferFence) {
-    resultPromise->set_value({NO_ERROR, base::unique_fd()});
+    resultPromise->set_value(Fence::NO_FENCE);
     return;
 }
 
-std::future<RenderEngineResult> RenderEngineThreaded::drawLayers(
+ftl::Future<FenceResult> RenderEngineThreaded::drawLayers(
         const DisplaySettings& display, const std::vector<LayerSettings>& layers,
         const std::shared_ptr<ExternalTexture>& buffer, const bool useFramebufferCache,
         base::unique_fd&& bufferFence) {
     ATRACE_CALL();
-    const auto resultPromise = std::make_shared<std::promise<RenderEngineResult>>();
-    std::future<RenderEngineResult> resultFuture = resultPromise->get_future();
+    const auto resultPromise = std::make_shared<std::promise<FenceResult>>();
+    std::future<FenceResult> resultFuture = resultPromise->get_future();
     int fd = bufferFence.release();
     {
         std::lock_guard lock(mThreadMutex);
diff --git a/libs/renderengine/threaded/RenderEngineThreaded.h b/libs/renderengine/threaded/RenderEngineThreaded.h
index 1340902..bf2ebea 100644
--- a/libs/renderengine/threaded/RenderEngineThreaded.h
+++ b/libs/renderengine/threaded/RenderEngineThreaded.h
@@ -56,11 +56,11 @@
     void useProtectedContext(bool useProtectedContext) override;
     void cleanupPostRender() override;
 
-    std::future<RenderEngineResult> drawLayers(const DisplaySettings& display,
-                                               const std::vector<LayerSettings>& layers,
-                                               const std::shared_ptr<ExternalTexture>& buffer,
-                                               const bool useFramebufferCache,
-                                               base::unique_fd&& bufferFence) override;
+    ftl::Future<FenceResult> drawLayers(const DisplaySettings& display,
+                                        const std::vector<LayerSettings>& layers,
+                                        const std::shared_ptr<ExternalTexture>& buffer,
+                                        const bool useFramebufferCache,
+                                        base::unique_fd&& bufferFence) override;
 
     void cleanFramebufferCache() override;
     int getContextPriority() override;
@@ -73,7 +73,7 @@
     void mapExternalTextureBuffer(const sp<GraphicBuffer>& buffer, bool isRenderable) override;
     void unmapExternalTextureBuffer(const sp<GraphicBuffer>& buffer) override;
     bool canSkipPostRenderCleanup() const override;
-    void drawLayersInternal(const std::shared_ptr<std::promise<RenderEngineResult>>&& resultPromise,
+    void drawLayersInternal(const std::shared_ptr<std::promise<FenceResult>>&& resultPromise,
                             const DisplaySettings& display,
                             const std::vector<LayerSettings>& layers,
                             const std::shared_ptr<ExternalTexture>& buffer,