diff --git a/include/transport/usermanager.h b/include/transport/usermanager.h
index 153be1bf1c9c0d39cb4c76cc7eb5e68bd47eb1d6..e327240bc6812bfb5fb3f2aa8a67c11ab797cf15 100644
--- a/include/transport/usermanager.h
+++ b/include/transport/usermanager.h
@@ -41,7 +41,7 @@ class UserManager {
 		/// Creates new UserManager.
 		/// \param component Component which's presence will be handled
 		/// \param storageBackend Storage backend used to fetch UserInfos
-		UserManager(Component *component, StorageBackend *storageBackend);
+		UserManager(Component *component, StorageBackend *storageBackend = NULL);
 
 		/// Destroys UserManager.
 		~UserManager();