diff --git a/reactos/include/ndk/ifssupp.h b/reactos/include/ndk/ifssupp.h
index 2ebc600b46e..4105262485d 100644
--- a/reactos/include/ndk/ifssupp.h
+++ b/reactos/include/ndk/ifssupp.h
@@ -38,6 +38,9 @@ typedef struct _RTL_SPLAY_LINKS
     struct _RTL_SPLAY_LINKS *RightChild;
 } RTL_SPLAY_LINKS, *PRTL_SPLAY_LINKS;
 
+typedef struct _RTL_GENERIC_TABLE RTL_GENERIC_TABLE, *PRTL_GENERIC_TABLE;
+typedef ULONG TABLE_SEARCH_RESULT;
+
 #if defined(USE_LPC6432)
 #define LPC_CLIENT_ID CLIENT_ID64
 #define LPC_SIZE_T ULONGLONG