diff --git a/src/game/Unit.cpp b/src/game/Unit.cpp
index 2cb70f2f5..943d73b49 100644
--- a/src/game/Unit.cpp
+++ b/src/game/Unit.cpp
@@ -11221,8 +11221,9 @@ int32 Unit::CalculateSpellDuration(SpellEntry const* spellProto, SpellEffectInde
         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);
+        // Modify from SPELL_AURA_MOD_DURATION_OF_EFFECTS_BY_DISPEL aura for negatve effects (stack always ?)
+        if (!IsPositiveEffect(spellProto->Id, effect_index))
+            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);
 
@@ -13538,4 +13539,4 @@ bool Unit::CheckAndIncreaseCastCounter()
 
     ++m_castCounter;
     return true;
-}
\ No newline at end of file
+}
diff --git a/src/shared/revision_nr.h b/src/shared/revision_nr.h
index bf58c5d48..d2951c59e 100644
--- a/src/shared/revision_nr.h
+++ b/src/shared/revision_nr.h
@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "9428"
+ #define REVISION_NR "9429"
 #endif // __REVISION_NR_H__