diff --git a/libs/hwui/FrameMetricsObserver.h b/libs/hwui/FrameMetricsObserver.h
index ba72e93..0b9ae5c 100644
--- a/libs/hwui/FrameMetricsObserver.h
+++ b/libs/hwui/FrameMetricsObserver.h
@@ -23,7 +23,7 @@
 
 class FrameMetricsObserver : public VirtualLightRefBase {
 public:
-    virtual void notify(const int64_t* buffer);
+    virtual void notify(const int64_t* buffer) = 0;
 };
 
 };  // namespace uirenderer