--- a/src/lib/dhcpsrv/timer_mgr.cc
+++ b/src/lib/dhcpsrv/timer_mgr.cc
@@ -14,7 +14,9 @@
#include <boost/scoped_ptr.hpp>
+#include <map>
#include <functional>
+#include <string>
#include <utility>
using namespace isc;