diff --git a/libs/binder/OS.h b/libs/binder/OS.h
index d6e1c78..5ab8bab 100644
--- a/libs/binder/OS.h
+++ b/libs/binder/OS.h
@@ -20,6 +20,7 @@
 
 #include <android-base/result.h>
 #include <android-base/unique_fd.h>
+#include <binder/RpcTransport.h>
 #include <utils/Errors.h>
 
 namespace android {
@@ -30,4 +31,6 @@
 
 status_t dupFileDescriptor(int oldFd, int* newFd);
 
+std::unique_ptr<RpcTransportCtxFactory> makeDefaultRpcTransportCtxFactory();
+
 } // namespace android