diff --git a/src/game/SharedDefines.h b/src/game/SharedDefines.h
index 75d23b49c..be037ace7 100644
--- a/src/game/SharedDefines.h
+++ b/src/game/SharedDefines.h
@@ -735,7 +735,7 @@ enum SpellEffects
     SPELL_EFFECT_TALENT_SPEC_COUNT         = 161,
     SPELL_EFFECT_TALENT_SPEC_SELECT        = 162,
     SPELL_EFFECT_163                       = 163,
-    SPELL_EFFECT_164                       = 164,
+    SPELL_EFFECT_CANCEL_AURA               = 164,
     TOTAL_SPELL_EFFECTS                    = 165
 };
 
diff --git a/src/game/Spell.h b/src/game/Spell.h
index 712fc1099..599bf106d 100644
--- a/src/game/Spell.h
+++ b/src/game/Spell.h
@@ -346,6 +346,7 @@ class Spell
         void EffectPlayMusic(SpellEffectIndex eff_idx);
         void EffectSpecCount(SpellEffectIndex eff_idx);
         void EffectActivateSpec(SpellEffectIndex eff_idx);
+        void EffectCancelAura(SpellEffectIndex eff_idx);
 
         Spell(Unit* caster, SpellEntry const *info, bool triggered, ObjectGuid originalCasterGUID = ObjectGuid(), SpellEntry const* triggeredBy = NULL);
         ~Spell();
diff --git a/src/game/SpellEffects.cpp b/src/game/SpellEffects.cpp
index 6ef314058..4796de05c 100644
--- a/src/game/SpellEffects.cpp
+++ b/src/game/SpellEffects.cpp
@@ -223,8 +223,8 @@ pEffect SpellEffects[TOTAL_SPELL_EFFECTS]=
     &Spell::EffectNULL,                                     //160 SPELL_EFFECT_160                      single spell: Nerub'ar Web Random Unit
     &Spell::EffectSpecCount,                                //161 SPELL_EFFECT_TALENT_SPEC_COUNT        second talent spec (learn/revert)
     &Spell::EffectActivateSpec,                             //162 SPELL_EFFECT_TALENT_SPEC_SELECT       activate primary/secondary spec
-    &Spell::EffectNULL,                                     //163
-    &Spell::EffectNULL,                                     //164 cancel's some aura...
+    &Spell::EffectUnused,                                   //163 unused in 3.3.5a
+    &Spell::EffectCancelAura,                               //164 SPELL_EFFECT_CANCEL_AURA
 };
 
 void Spell::EffectEmpty(SpellEffectIndex /*eff_idx*/)
@@ -8805,3 +8805,19 @@ void Spell::EffectTeachTaxiNode( SpellEffectIndex eff_idx )
         player->SendDirectMessage( &data );
     }
 }
+
+void Spell::EffectCancelAura(SpellEffectIndex eff_idx)
+{
+    if (!unitTarget)
+        return;
+
+    uint32 spellId = m_spellInfo->EffectTriggerSpell[eff_idx];
+
+    if (!sSpellStore.LookupEntry(spellId))
+    {
+        sLog.outError("Spell::EffectCancelAura: spell %u doesn't exist", spellId);
+        return;
+    }
+
+    unitTarget->RemoveAurasDueToSpell(spellId);
+}
diff --git a/src/shared/revision_nr.h b/src/shared/revision_nr.h
index 69ac39be6..609e36a7d 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 "11300"
+ #define REVISION_NR "11301"
 #endif // __REVISION_NR_H__