diff --git a/Source/Game/Entities/Unit/Unit.Spells.cs b/Source/Game/Entities/Unit/Unit.Spells.cs
index 7775af1c8..46da57320 100644
--- a/Source/Game/Entities/Unit/Unit.Spells.cs
+++ b/Source/Game/Entities/Unit/Unit.Spells.cs
@@ -3157,7 +3157,7 @@ namespace Game.Entities
                 if (spellInfo.GetDiminishingReturnsGroupForSpell() != diminishGroup)
                     continue;
 
-                int existingDuration = itr.Value.GetBase().GetMaxDuration();
+                int existingDuration = itr.Value.GetBase().GetDuration();
                 int newDuration = auraSpellInfo.GetMaxDuration();
                 ApplyDiminishingToDuration(auraSpellInfo, ref newDuration, caster, level);
                 if (newDuration > 0 && newDuration < existingDuration)