diff --git a/src/ims/in-memory-storage-fifo.cpp b/src/ims/in-memory-storage-fifo.cpp
new file mode 100644
index 0000000..df6e173
--- /dev/null
+++ b/src/ims/in-memory-storage-fifo.cpp
@@ -0,0 +1,64 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2017 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "in-memory-storage-fifo.hpp"
+
+namespace ndn {
+
+InMemoryStorageFifo::InMemoryStorageFifo(size_t limit)
+  : InMemoryStorage(limit)
+{
+}
+
+InMemoryStorageFifo::InMemoryStorageFifo(boost::asio::io_service& ioService, size_t limit)
+  : InMemoryStorage(ioService, limit)
+{
+}
+
+void
+InMemoryStorageFifo::afterInsert(InMemoryStorageEntry* entry)
+{
+  BOOST_ASSERT(m_cleanupIndex.size() <= size());
+  m_cleanupIndex.insert(entry);
+}
+
+bool
+InMemoryStorageFifo::evictItem()
+{
+  if (!m_cleanupIndex.get<byArrival>().empty()) {
+    CleanupIndex::index<byArrival>::type::iterator it = m_cleanupIndex.get<byArrival>().begin();
+    eraseImpl((*it)->getFullName());
+    m_cleanupIndex.get<byArrival>().erase(it);
+    return true;
+  }
+
+  return false;
+}
+
+void
+InMemoryStorageFifo::beforeErase(InMemoryStorageEntry* entry)
+{
+  CleanupIndex::index<byEntity>::type::iterator it = m_cleanupIndex.get<byEntity>().find(entry);
+  if (it != m_cleanupIndex.get<byEntity>().end())
+    m_cleanupIndex.get<byEntity>().erase(it);
+}
+
+} // namespace ndn