diff --git a/src/game/Object/SpellMgr.cpp b/src/game/Object/SpellMgr.cpp
index 1409ecf6..6fad1b8d 100644
--- a/src/game/Object/SpellMgr.cpp
+++ b/src/game/Object/SpellMgr.cpp
@@ -738,6 +738,7 @@ bool IsPositiveEffect(SpellEntry const* spellproto, SpellEffectIndex effIndex)
                         { return false; }
                     break;
                 case SPELL_AURA_MOD_DAMAGE_TAKEN:           // dependent from bas point sign (positive -> negative)
+                case SPELL_AURA_MOD_DAMAGE_PERCENT_TAKEN:
                     if (spellproto->CalculateSimpleValue(effIndex) < 0)
                         { return true; }
                     // let check by target modes (for Amplify Magic cases/etc)