diff --git a/configure.py b/configure.py
index edfe481a7c..1f888636fd 100755
--- a/configure.py
+++ b/configure.py
@@ -288,6 +288,7 @@ urchin_core = (['database.cc',
                  'gms/failure_detector.cc',
                  'gms/gms.cc',
                  'gms/gossip_digest_syn.cc',
+                 'gms/gossip_digest_ack.cc',
                  'dht/i_partitioner.cc',
                  'dht/murmur3_partitioner.cc',
                  'dht/byte_ordered_partitioner.cc',
diff --git a/gms/gms.cc b/gms/gms.cc
index befd01062d..19c03da454 100644
--- a/gms/gms.cc
+++ b/gms/gms.cc
@@ -23,18 +23,6 @@
 namespace gms {
 
 
-std::ostream& operator<<(std::ostream& os, const gossip_digest_ack& ack) {
-    os << "digests:{";
-    for (auto& d : ack._digests) {
-        os << d << " ";
-    }
-    os << "} ";
-    os << "endpoint_state:{";
-    for (auto& d : ack._map) {
-        os << "[" << d.first << "->" << d.second << "]";
-    }
-    return os << "}";
-}
 
 std::ostream& operator<<(std::ostream& os, const gossip_digest_ack2& ack2) {
     os << "endpoint_state:{";
diff --git a/gms/gossip_digest_ack.cc b/gms/gossip_digest_ack.cc
new file mode 100644
index 0000000000..37f663792d
--- /dev/null
+++ b/gms/gossip_digest_ack.cc
@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Modified by Cloudius Systems.
+ * Copyright 2015 Cloudius Systems.
+ */
+
+#include "gms/gossip_digest_ack.hh"
+#include <ostream>
+
+namespace gms {
+
+std::ostream& operator<<(std::ostream& os, const gossip_digest_ack& ack) {
+    os << "digests:{";
+    for (auto& d : ack._digests) {
+        os << d << " ";
+    }
+    os << "} ";
+    os << "endpoint_state:{";
+    for (auto& d : ack._map) {
+        os << "[" << d.first << "->" << d.second << "]";
+    }
+    return os << "}";
+}
+
+} // namespace gms