diff --git a/src/server/game/Grids/GridDefines.h b/src/server/game/Grids/GridDefines.h
index 3572fff63d..8eae906ba8 100644
--- a/src/server/game/Grids/GridDefines.h
+++ b/src/server/game/Grids/GridDefines.h
@@ -20,6 +20,7 @@
 #define TRINITY_GRIDDEFINES_H
 
 #include "Common.h"
+#include "ObjectGuid.h"
 #include "NGrid.h"
 #include <cmath>