diff --git a/src/server/game/AI/SmartScripts/SmartScript.h b/src/server/game/AI/SmartScripts/SmartScript.h
index a3d75f1889b..c38cca8d98f 100644
--- a/src/server/game/AI/SmartScripts/SmartScript.h
+++ b/src/server/game/AI/SmartScripts/SmartScript.h
@@ -247,7 +247,7 @@ class SmartScript
                 DecPhase(abs(p));
         }
 
-        void DecPhase(int32 p = 1) { mEventPhase  -= (mEventPhase < (uint32)p ? (uint32)p - mEventPhase : (uint32)p); }
+        void DecPhase(int32 p = 1) { mEventPhase  -= (mEventPhase < (uint32)p ? (uint32)p - ((uint32)p - mEventPhase) : (uint32)p); }
         bool IsInPhase(uint32 p) const { return ((1 << (mEventPhase - 1)) & p) != 0; }
         void SetPhase(uint32 p = 0) { mEventPhase = p; }