diff --git a/src/usermanager.cpp b/src/usermanager.cpp
index 7e138d45c7c1b5c8f76496c850b88b79866156c4..19c50b775031567d443ff7c44efe81ec51c13e5f 100644
--- a/src/usermanager.cpp
+++ b/src/usermanager.cpp
@@ -25,9 +25,14 @@
 #include "transport/conversationmanager.h"
 #include "transport/rostermanager.h"
 #include "storageresponder.h"
+#include "log4cxx/logger.h"
+
+using namespace log4cxx;
 
 namespace Transport {
 
+static LoggerPtr logger = Logger::getLogger("UserManager");
+
 UserManager::UserManager(Component *component, StorageBackend *storageBackend) {
 	m_cachedUser = NULL;
 	m_onlineBuddies = 0;
@@ -130,6 +135,7 @@ void UserManager::handlePresence(Swift::Presence::ref presence) {
 		}
 
 		if (!registered) {
+			LOG4CXX_WARN(logger, "Unregistered user " << userkey << " tried to login");
 			// TODO: logging
 			return;
 		}