diff --git a/src/server/scripts/Northrend/IcecrownCitadel/boss_professor_putricide.cpp b/src/server/scripts/Northrend/IcecrownCitadel/boss_professor_putricide.cpp
index b9a9f4e62dd..ecc2ec855a5 100644
--- a/src/server/scripts/Northrend/IcecrownCitadel/boss_professor_putricide.cpp
+++ b/src/server/scripts/Northrend/IcecrownCitadel/boss_professor_putricide.cpp
@@ -914,6 +914,7 @@ class spell_putricide_ooze_channel : public SpellScriptLoader
 
             void StartAttack()
             {
+                GetCaster()->ClearUnitState(UNIT_STATE_CASTING);
                 GetCaster()->DeleteThreatList();
                 GetCaster()->ToCreature()->AI()->AttackStart(GetHitUnit());
                 GetCaster()->AddThreat(GetHitUnit(), 500000000.0f);    // value seen in sniff