diff --git a/src/lib/config/tests/fake_session.cc b/src/lib/config/tests/fake_session.cc
index c88c29d871..ab5da60734 100644
--- a/src/lib/config/tests/fake_session.cc
+++ b/src/lib/config/tests/fake_session.cc
@@ -90,8 +90,7 @@ getFirstMessage(std::string& group, std::string& to)
 }
 
 void
-addMessage(ElementPtr msg, const std::string& group, const std::string& to)
-{
+addMessage(ElementPtr msg, const std::string& group, const std::string& to) {
     ElementPtr m_el = Element::createList();
     m_el->add(Element::create(group));
     m_el->add(Element::create(to));
@@ -247,7 +246,7 @@ Session::unsubscribe(std::string group, std::string instance) {
     listRemove(subscriptions, s_el);
 }
 
-unsigned int
+int
 Session::group_sendmsg(ElementPtr msg, std::string group,
                        std::string to, std::string instance UNUSED_PARAM)
 {
@@ -264,7 +263,7 @@ Session::group_recvmsg(ElementPtr& envelope, ElementPtr& msg,
     return (recvmsg(envelope, msg, nonblock, seq));
 }
 
-unsigned int
+int
 Session::reply(ElementPtr& envelope, ElementPtr& newmsg) {
     //cout << "[XX] client sends reply: " << newmsg << endl;
     //cout << "[XX] env: " << envelope << endl;
diff --git a/src/lib/config/tests/fake_session.h b/src/lib/config/tests/fake_session.h
index 195c266178..d1d0d65d5a 100644
--- a/src/lib/config/tests/fake_session.h
+++ b/src/lib/config/tests/fake_session.h
@@ -86,16 +86,16 @@ namespace isc {
                            std::string instance = "*");
             void unsubscribe(std::string group,
                              std::string instance = "*");
-            unsigned int group_sendmsg(isc::data::ElementPtr msg,
-                                       std::string group,
-                                       std::string instance = "*",
-                                       std::string to = "*");
+            int group_sendmsg(isc::data::ElementPtr msg,
+                              std::string group,
+                              std::string instance = "*",
+                              std::string to = "*");
             bool group_recvmsg(isc::data::ElementPtr& envelope,
                                isc::data::ElementPtr& msg,
                                bool nonblock = true,
                                int seq = -1);
-            unsigned int reply(isc::data::ElementPtr& envelope,
-                               isc::data::ElementPtr& newmsg);
+            int reply(isc::data::ElementPtr& envelope,
+                      isc::data::ElementPtr& newmsg);
             bool hasQueuedMsgs();
 
         };