diff --git a/reactos/win32ss/gdi/eng/driverobj.h b/reactos/win32ss/gdi/eng/driverobj.h
index d433bbdc2e9..92a0bab7ad9 100644
--- a/reactos/win32ss/gdi/eng/driverobj.h
+++ b/reactos/win32ss/gdi/eng/driverobj.h
@@ -14,7 +14,7 @@ typedef DRIVEROBJ *PDRIVEROBJ;
 BOOL NTAPI DRIVEROBJ_Cleanup(PVOID pObject);
 
 
-#define DRIVEROBJ_AllocObjectWithHandle()  ((PEDRIVEROBJ)GDIOBJ_AllocObjWithHandle(GDI_OBJECT_TYPE_DRIVEROBJ, sizeof(DRIVEROBJ)))
+#define DRIVEROBJ_AllocObjectWithHandle()  ((PEDRIVEROBJ)GDIOBJ_AllocObjWithHandle(GDI_OBJECT_TYPE_DRIVEROBJ, sizeof(EDRIVEROBJ)))
 #define DRIVEROBJ_FreeObjectByHandle(hdo) GDIOBJ_FreeObjByHandle((HGDIOBJ)hdo, GDI_OBJECT_TYPE_DRIVEROBJ)
 #define DRIVEROBJ_UnlockObject(pdo) GDIOBJ_vUnlockObject((POBJ)pdo)