diff --git a/ndn-cxx/net/asio-fwd.hpp b/ndn-cxx/detail/asio-fwd.hpp
similarity index 92%
rename from ndn-cxx/net/asio-fwd.hpp
rename to ndn-cxx/detail/asio-fwd.hpp
index fb80ee5..5789abd 100644
--- a/ndn-cxx/net/asio-fwd.hpp
+++ b/ndn-cxx/detail/asio-fwd.hpp
@@ -19,8 +19,8 @@
  * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
  */
 
-#ifndef NDN_NET_ASIO_FWD_HPP
-#define NDN_NET_ASIO_FWD_HPP
+#ifndef NDN_DETAIL_ASIO_FWD_HPP
+#define NDN_DETAIL_ASIO_FWD_HPP
 
 #include <boost/version.hpp>
 
@@ -37,4 +37,4 @@
 } // namespace asio
 } // namespace boost
 
-#endif // NDN_NET_ASIO_FWD_HPP
+#endif // NDN_DETAIL_ASIO_FWD_HPP
diff --git a/ndn-cxx/face.hpp b/ndn-cxx/face.hpp
index 2711646..434e947 100644
--- a/ndn-cxx/face.hpp
+++ b/ndn-cxx/face.hpp
@@ -25,9 +25,9 @@
 #include "ndn-cxx/data.hpp"
 #include "ndn-cxx/interest.hpp"
 #include "ndn-cxx/interest-filter.hpp"
+#include "ndn-cxx/detail/asio-fwd.hpp"
 #include "ndn-cxx/encoding/nfd-constants.hpp"
 #include "ndn-cxx/lp/nack.hpp"
-#include "ndn-cxx/net/asio-fwd.hpp"
 #include "ndn-cxx/security/key-chain.hpp"
 #include "ndn-cxx/security/signing-info.hpp"
 
diff --git a/ndn-cxx/net/dns.hpp b/ndn-cxx/net/dns.hpp
index 050c277..660efcd 100644
--- a/ndn-cxx/net/dns.hpp
+++ b/ndn-cxx/net/dns.hpp
@@ -22,7 +22,7 @@
 #ifndef NDN_NET_DNS_HPP
 #define NDN_NET_DNS_HPP
 
-#include "ndn-cxx/net/asio-fwd.hpp"
+#include "ndn-cxx/detail/asio-fwd.hpp"
 #include "ndn-cxx/util/time.hpp"
 
 #include <boost/asio/ip/address.hpp>
diff --git a/ndn-cxx/net/face-uri.hpp b/ndn-cxx/net/face-uri.hpp
index 9ec50e5..650e7c7 100644
--- a/ndn-cxx/net/face-uri.hpp
+++ b/ndn-cxx/net/face-uri.hpp
@@ -28,7 +28,7 @@
 #ifndef NDN_NET_FACE_URI_HPP
 #define NDN_NET_FACE_URI_HPP
 
-#include "ndn-cxx/net/asio-fwd.hpp"
+#include "ndn-cxx/detail/asio-fwd.hpp"
 #include "ndn-cxx/net/ethernet.hpp"
 #include "ndn-cxx/util/time.hpp"
 
diff --git a/ndn-cxx/net/network-monitor.hpp b/ndn-cxx/net/network-monitor.hpp
index 211ed30..480a798 100644
--- a/ndn-cxx/net/network-monitor.hpp
+++ b/ndn-cxx/net/network-monitor.hpp
@@ -25,7 +25,7 @@
 #ifndef NDN_NET_NETWORK_MONITOR_HPP
 #define NDN_NET_NETWORK_MONITOR_HPP
 
-#include "ndn-cxx/net/asio-fwd.hpp"
+#include "ndn-cxx/detail/asio-fwd.hpp"
 #include "ndn-cxx/net/network-interface.hpp"
 
 #include <vector>
diff --git a/ndn-cxx/transport/transport.hpp b/ndn-cxx/transport/transport.hpp
index 007acf5..daede21 100644
--- a/ndn-cxx/transport/transport.hpp
+++ b/ndn-cxx/transport/transport.hpp
@@ -22,9 +22,9 @@
 #ifndef NDN_TRANSPORT_TRANSPORT_HPP
 #define NDN_TRANSPORT_TRANSPORT_HPP
 
+#include "ndn-cxx/detail/asio-fwd.hpp"
 #include "ndn-cxx/detail/common.hpp"
 #include "ndn-cxx/encoding/block.hpp"
-#include "ndn-cxx/net/asio-fwd.hpp"
 
 #include <boost/system/error_code.hpp>
 
diff --git a/ndn-cxx/util/scheduler.hpp b/ndn-cxx/util/scheduler.hpp
index 9a2d542..d5051b7 100644
--- a/ndn-cxx/util/scheduler.hpp
+++ b/ndn-cxx/util/scheduler.hpp
@@ -22,7 +22,7 @@
 #ifndef NDN_UTIL_SCHEDULER_HPP
 #define NDN_UTIL_SCHEDULER_HPP
 
-#include "ndn-cxx/net/asio-fwd.hpp"
+#include "ndn-cxx/detail/asio-fwd.hpp"
 #include "ndn-cxx/util/time.hpp"
 
 #include <boost/system/error_code.hpp>