Index: game/Unit.cpp
===================================================================
--- game/Unit.cpp	(revision 5121)
+++ game/Unit.cpp	(working copy)
@@ -6939,7 +6924,8 @@
             spellProto->EffectApplyAuraName[effect_index] == SPELL_AURA_PERIODIC_LEECH) )
             modOwner->ApplySpellMod(spellProto->Id, SPELLMOD_DOT, value);
 
-        modOwner->ApplySpellMod(spellProto->Id, SPELLMOD_DAMAGE, value);
+		if ( spellProto->Effect[effect_index] != SPELL_EFFECT_WEAPON_PERCENT_DAMAGE )
+			modOwner->ApplySpellMod(spellProto->Id, SPELLMOD_DAMAGE, value);
     }
 
     return value;