diff --git a/src/requester.cpp b/src/requester.cpp
index af3f6c4..b0f65d5 100644
--- a/src/requester.cpp
+++ b/src/requester.cpp
@@ -38,6 +38,7 @@
 
 namespace ndn {
 namespace ndncert {
+namespace requester {
 
 NDN_LOG_INIT(ndncert.client);
 
@@ -73,7 +74,6 @@
   return caItem;
 }
 
-
 optional<CaProfile>
 Requester::onCaProfileResponseAfterRedirection(const Data& reply, const Name& caCertFullName)
 {
@@ -324,5 +324,6 @@
                                " and Error Info: " + std::get<1>(errorInfo)));
 }
 
+} // namespace requester
 } // namespace ndncert
 } // namespace ndn