diff --git a/reactos/drivers/filesystems/fastfat/create.c b/reactos/drivers/filesystems/fastfat/create.c
index d3898fdb8ed..a9d4b256dff 100644
--- a/reactos/drivers/filesystems/fastfat/create.c
+++ b/reactos/drivers/filesystems/fastfat/create.c
@@ -522,7 +522,7 @@ VfatCreateFile ( PDEVICE_OBJECT DeviceObject, PIRP Irp )
 			return(STATUS_OBJECT_NAME_INVALID);
 		}
 	}
-        if (FileObject->RelatedFileObject && PathNameU.Buffer[0] == L'\\')
+        if (FileObject->RelatedFileObject && PathNameU.Length > sizeof(WCHAR) && PathNameU.Buffer[0] == L'\\')
         {
             return(STATUS_OBJECT_NAME_INVALID);
         }