diff --git a/src/server/scripts/Northrend/Ulduar/ulduar/instance_ulduar.cpp b/src/server/scripts/Northrend/Ulduar/ulduar/instance_ulduar.cpp
index 1373e3e720..27fbb3ff04 100644
--- a/src/server/scripts/Northrend/Ulduar/ulduar/instance_ulduar.cpp
+++ b/src/server/scripts/Northrend/Ulduar/ulduar/instance_ulduar.cpp
@@ -46,7 +46,7 @@ public:
         uint64 uiIgnisGUID;
         uint64 uiRazorscaleGUID;
         uint64 uiRazorscaleController;
-        uint64 uiRazorHarpoonGUIDs[3];
+        uint64 uiRazorHarpoonGUIDs[4];
         uint64 uiExpCommanderGUID;
         uint64 uiXT002GUID;
         uint64 uiAssemblyGUIDs[3];