diff --git a/libs/binder/OS.h b/libs/binder/OS.h
index e802e9c..d6e1c78 100644
--- a/libs/binder/OS.h
+++ b/libs/binder/OS.h
@@ -28,4 +28,6 @@
 
 status_t getRandomBytes(uint8_t* data, size_t size);
 
+status_t dupFileDescriptor(int oldFd, int* newFd);
+
 } // namespace android