diff --git a/src/server/game/Achievements/AchievementMgr.h b/src/server/game/Achievements/AchievementMgr.h
index faab7fb528..8272b8d4fd 100644
--- a/src/server/game/Achievements/AchievementMgr.h
+++ b/src/server/game/Achievements/AchievementMgr.h
@@ -21,6 +21,7 @@
 #include "DatabaseEnvFwd.h"
 #include "DBCEnums.h"
 #include "DBCStores.h"
+#include "Duration.h"
 #include "ObjectGuid.h"
 #include <string>
 #include <unordered_map>