diff --git a/src/scripts/northrend/crusaders_coliseum/trial_of_the_champion/boss_grand_champions.cpp b/src/scripts/northrend/crusaders_coliseum/trial_of_the_champion/boss_grand_champions.cpp
index 8f0efc86ea..7e4161090d 100644
--- a/src/scripts/northrend/crusaders_coliseum/trial_of_the_champion/boss_grand_champions.cpp
+++ b/src/scripts/northrend/crusaders_coliseum/trial_of_the_champion/boss_grand_champions.cpp
@@ -278,7 +278,7 @@ struct TRINITY_DLL_DECL generic_vehicleAI_toc5AI : public npc_escortAI
                 }
             }
             uiShieldBreakerTimer = 7000;
-        }else uiShieldBreakerTimer <= uiDiff;
+        }else uiShieldBreakerTimer -= uiDiff;
 
         DoMeleeAttackIfReady();
     }