diff --git a/reactos/w32api/include/ddk/winddk.h b/reactos/w32api/include/ddk/winddk.h
index 35468ced18a..d86cf1dd276 100644
--- a/reactos/w32api/include/ddk/winddk.h
+++ b/reactos/w32api/include/ddk/winddk.h
@@ -3176,6 +3176,8 @@ typedef NTSTATUS DDKAPI
 #define RTL_REGISTRY_WINDOWS_NT           3
 #define RTL_REGISTRY_DEVICEMAP            4
 #define RTL_REGISTRY_USER                 5
+#define RTL_REGISTRY_HANDLE               0x40000000
+#define RTL_REGISTRY_OPTIONAL             0x80000000
 
 /* RTL_QUERY_REGISTRY_TABLE.Flags */
 #define RTL_QUERY_REGISTRY_SUBKEY         0x00000001