diff --git a/src/game/SpellAuraDefines.h b/src/game/SpellAuraDefines.h
index cb5951a5f..fb0754a51 100644
--- a/src/game/SpellAuraDefines.h
+++ b/src/game/SpellAuraDefines.h
@@ -288,7 +288,7 @@ enum AuraType
     SPELL_AURA_243 = 243,
     SPELL_AURA_COMPREHEND_LANGUAGE = 244,
     SPELL_AURA_MOD_DURATION_OF_MAGIC_EFFECTS = 245,
-    SPELL_AURA_246 = 246,
+    SPELL_AURA_MOD_DURATION_OF_EFFECTS_BY_DISPEL = 246,
     SPELL_AURA_247 = 247,
     SPELL_AURA_MOD_COMBAT_RESULT_CHANCE = 248,
     SPELL_AURA_CONVERT_RUNE = 249,
diff --git a/src/game/Unit.cpp b/src/game/Unit.cpp
index 767808962..4d0854be4 100644
--- a/src/game/Unit.cpp
+++ b/src/game/Unit.cpp
@@ -9319,6 +9319,8 @@ int32 Unit::CalculateSpellDuration(SpellEntry const* spellProto, uint8 effect_in
         int32 mechanic = GetEffectMechanic(spellProto, effect_index);
         // Find total mod value (negative bonus)
         int32 durationMod_always = target->GetTotalAuraModifierByMiscValue(SPELL_AURA_MECHANIC_DURATION_MOD, mechanic);
+        // Modify from SPELL_AURA_MOD_DURATION_OF_EFFECTS_BY_DISPEL aura (stack always ?)
+        durationMod_always+=target->GetTotalAuraModifierByMiscValue(SPELL_AURA_MOD_DURATION_OF_EFFECTS_BY_DISPEL, spellProto->Dispel);
         // Find max mod (negative bonus)
         int32 durationMod_not_stack = target->GetMaxNegativeAuraModifierByMiscValue(SPELL_AURA_MECHANIC_DURATION_MOD_NOT_STACK, mechanic);