diff --git a/hwc2_device/DrmHwcTwo.h b/hwc2_device/DrmHwcTwo.h
index 83fbd79..5379cba 100644
--- a/hwc2_device/DrmHwcTwo.h
+++ b/hwc2_device/DrmHwcTwo.h
@@ -64,6 +64,9 @@
   bool UnbindDisplay(DrmDisplayPipeline *pipeline) override;
   void FinalizeDisplayBinding() override;
 
+  void SendVsyncEventToClient(hwc2_display_t displayid, int64_t timestamp,
+                              uint32_t vsync_period) const;
+
  private:
   void SendHotplugEventToClient(hwc2_display_t displayid, bool connected);