diff --git a/src/server/game/Entities/Unit/Unit.h b/src/server/game/Entities/Unit/Unit.h
index 07028c48f8..9181b3da00 100644
--- a/src/server/game/Entities/Unit/Unit.h
+++ b/src/server/game/Entities/Unit/Unit.h
@@ -863,6 +863,7 @@ struct CleanDamage
     MeleeHitOutcome hitOutCome;
 };
 
+struct CalcDamageInfo;
 struct SpellNonMeleeDamage;
 
 class TC_GAME_API DamageInfo