diff --git a/reactos/w32api/include/ddk/winddk.h b/reactos/w32api/include/ddk/winddk.h
index 10257ac771c..6e73231aa1d 100644
--- a/reactos/w32api/include/ddk/winddk.h
+++ b/reactos/w32api/include/ddk/winddk.h
@@ -101,6 +101,8 @@ struct _SECTION_OBJECT;
 struct _IO_STATUS_BLOCK;
 struct _DEVICE_DESCRIPTION;
 struct _SCATTER_GATHER_LIST;
+struct _DRIVE_LAYOUT_INFORMATION;
+struct _DRIVE_LAYOUT_INFORMATION_EX;
 
 DECLARE_INTERNAL_OBJECT(ADAPTER_OBJECT)
 DECLARE_INTERNAL_OBJECT(DMA_ADAPTER)