diff --git a/src/kademlia/traversal_algorithm.cpp b/src/kademlia/traversal_algorithm.cpp
index 6011df64f..81e80b6f6 100644
--- a/src/kademlia/traversal_algorithm.cpp
+++ b/src/kademlia/traversal_algorithm.cpp
@@ -38,6 +38,7 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <libtorrent/kademlia/node.hpp>
 #include <libtorrent/session_status.hpp>
 #include <libtorrent/socket_io.hpp> // for read_*_endpoint
+#include <libtorrent/alert_types.hpp> // for dht_lookup
 
 #include <boost/bind.hpp>