diff --git a/include/winbase.h b/include/winbase.h
index 67c29b51c55..1347f8cd1c3 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -1682,6 +1682,9 @@ typedef enum _PROC_THREAD_ATTRIBUTE_NUM
 #define PROC_THREAD_ATTRIBUTE_ALL_APPLICATION_PACKAGES_POLICY (ProcThreadAttributeAllApplicationPackagesPolicy | PROC_THREAD_ATTRIBUTE_INPUT)
 #define PROC_THREAD_ATTRIBUTE_WIN32K_FILTER (ProcThreadAttributeWin32kFilter | PROC_THREAD_ATTRIBUTE_INPUT)
 
+#define SYMBOLIC_LINK_FLAG_DIRECTORY (0x1)
+#define VALID_SYMBOLIC_LINK_FLAGS SYMBOLIC_LINK_FLAG_DIRECTORY
+
 WINBASEAPI BOOL        WINAPI ActivateActCtx(HANDLE,ULONG_PTR *);
 WINADVAPI  BOOL        WINAPI AddAccessAllowedAce(PACL,DWORD,DWORD,PSID);
 WINADVAPI  BOOL        WINAPI AddAccessAllowedAceEx(PACL,DWORD,DWORD,DWORD,PSID);