diff --git a/reactos/include/ddk/ntifs.h b/reactos/include/ddk/ntifs.h
index 6f162036ae4..9cc7e7874e2 100644
--- a/reactos/include/ddk/ntifs.h
+++ b/reactos/include/ddk/ntifs.h
@@ -758,6 +758,36 @@ typedef enum _TOKEN_INFORMATION_CLASS {
 	TokenSandBoxInert,TokenAuditPolicy,TokenOrigin,
 } TOKEN_INFORMATION_CLASS;
 
+#define SYMLINK_FLAG_RELATIVE   1
+
+typedef struct _REPARSE_DATA_BUFFER {
+    ULONG  ReparseTag;
+    USHORT ReparseDataLength;
+    USHORT Reserved;
+    union {
+        struct {
+            USHORT SubstituteNameOffset;
+            USHORT SubstituteNameLength;
+            USHORT PrintNameOffset;
+            USHORT PrintNameLength;
+            ULONG Flags;
+            WCHAR PathBuffer[1];
+        } SymbolicLinkReparseBuffer;
+        struct {
+            USHORT SubstituteNameOffset;
+            USHORT SubstituteNameLength;
+            USHORT PrintNameOffset;
+            USHORT PrintNameLength;
+            WCHAR PathBuffer[1];
+        } MountPointReparseBuffer;
+        struct {
+            UCHAR  DataBuffer[1];
+        } GenericReparseBuffer;
+    };
+} REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
+
+#define REPARSE_DATA_BUFFER_HEADER_SIZE   FIELD_OFFSET(REPARSE_DATA_BUFFER, GenericReparseBuffer)
+
 typedef struct _FILE_ACCESS_INFORMATION {
     ACCESS_MASK AccessFlags;
 } FILE_ACCESS_INFORMATION, *PFILE_ACCESS_INFORMATION;