diff --git a/src/server/game/Spells/Spell.h b/src/server/game/Spells/Spell.h
index 9a742e2d42b..bb33523eae5 100644
--- a/src/server/game/Spells/Spell.h
+++ b/src/server/game/Spells/Spell.h
@@ -20,6 +20,7 @@
 
 #include "ConditionMgr.h"
 #include "DBCEnums.h"
+#include "Duration.h"
 #include "ModelIgnoreFlags.h"
 #include "ObjectGuid.h"
 #include "Optional.h"