diff --git a/libs/gui/BLASTBufferQueue.cpp b/libs/gui/BLASTBufferQueue.cpp
index e5a2151..33335aa 100644
--- a/libs/gui/BLASTBufferQueue.cpp
+++ b/libs/gui/BLASTBufferQueue.cpp
@@ -837,4 +837,9 @@
     }
 }
 
+uint64_t BLASTBufferQueue::getLastAcquiredFrameNum() {
+    std::unique_lock _lock{mMutex};
+    return mLastAcquiredFrameNumber;
+}
+
 } // namespace android
diff --git a/libs/gui/include/gui/BLASTBufferQueue.h b/libs/gui/include/gui/BLASTBufferQueue.h
index 6c5b2aa..be46180 100644
--- a/libs/gui/include/gui/BLASTBufferQueue.h
+++ b/libs/gui/include/gui/BLASTBufferQueue.h
@@ -107,6 +107,7 @@
     void setSidebandStream(const sp<NativeHandle>& stream);
 
     uint32_t getLastTransformHint() const;
+    uint64_t getLastAcquiredFrameNum();
 
     virtual ~BLASTBufferQueue();