diff --git a/include/ndn-cpp/node.hpp b/include/ndn-cpp/node.hpp
index bbf89fd..b5e4e97 100644
--- a/include/ndn-cpp/node.hpp
+++ b/include/ndn-cpp/node.hpp
@@ -330,6 +330,8 @@
   PendingInterestTable pendingInterestTable_;
   RegisteredPrefixTable registeredPrefixTable_;
   Interest ndndIdFetcherInterest_;
+
+  int64_t faceId_; // internal face ID (needed for prefix de-registration)
   Buffer ndndId_;
 };