diff --git a/src/server/scripts/Northrend/Naxxramas/boss_thaddius.cpp b/src/server/scripts/Northrend/Naxxramas/boss_thaddius.cpp
index d71e12468..c1dd286dc 100644
--- a/src/server/scripts/Northrend/Naxxramas/boss_thaddius.cpp
+++ b/src/server/scripts/Northrend/Naxxramas/boss_thaddius.cpp
@@ -446,6 +446,7 @@ public:
                 else
                 {
                     me->SetHealth(me->GetMaxHealth());
+                    me->GetThreatMgr().ResetAllThreat();
                 }
             }
         }