diff --git a/src/security/v2/key-chain.hpp b/src/security/v2/key-chain.hpp
index f0299c3..e564326 100644
--- a/src/security/v2/key-chain.hpp
+++ b/src/security/v2/key-chain.hpp
@@ -503,6 +503,9 @@
 
 } // namespace v2
 } // namespace security
+
+using security::v2::KeyChain;
+
 } // namespace ndn
 
 #endif // NDN_SECURITY_V2_KEY_CHAIN_HPP