diff --git a/src/server/game/Spells/Auras/SpellAuras.cpp b/src/server/game/Spells/Auras/SpellAuras.cpp
index 57f98a4fa6..786c16b3e8 100644
--- a/src/server/game/Spells/Auras/SpellAuras.cpp
+++ b/src/server/game/Spells/Auras/SpellAuras.cpp
@@ -858,6 +858,11 @@ void Aura::Update(uint32 diff, Unit* caster)
     }
 }
 
+int32 Aura::CalcMaxDuration(Unit* caster) const
+{
+    return Aura::CalcMaxDuration(GetSpellInfo(), caster);
+}
+
 /*static*/ int32 Aura::CalcMaxDuration(SpellInfo const* spellInfo, WorldObject* caster)
 {
     return spellInfo->CalcDuration(caster);
diff --git a/src/server/game/Spells/Auras/SpellAuras.h b/src/server/game/Spells/Auras/SpellAuras.h
index 278660054f..00a72de3fa 100644
--- a/src/server/game/Spells/Auras/SpellAuras.h
+++ b/src/server/game/Spells/Auras/SpellAuras.h
@@ -149,7 +149,7 @@ class TC_GAME_API Aura
         int32 GetMaxDuration() const { return m_maxDuration; }
         void SetMaxDuration(int32 duration) { m_maxDuration = duration; }
         int32 CalcMaxDuration() const { return CalcMaxDuration(GetCaster()); }
-        int32 CalcMaxDuration(Unit* caster) const { return Aura::CalcMaxDuration(GetSpellInfo(), caster); }
+        int32 CalcMaxDuration(Unit* caster) const;
         static int32 CalcMaxDuration(SpellInfo const* spellInfo, WorldObject* caster);
         int32 GetDuration() const { return m_duration; }
         void SetDuration(int32 duration, bool withMods = false);