diff --git a/include/llvm/Support/COFF.h b/include/llvm/Support/COFF.h
index a39a3f9608e..74ae62b9348 100644
--- a/include/llvm/Support/COFF.h
+++ b/include/llvm/Support/COFF.h
@@ -511,7 +511,9 @@ namespace COFF {
     IMAGE_SUBSYSTEM_NATIVE = 1, ///< Device drivers and native Windows processes
     IMAGE_SUBSYSTEM_WINDOWS_GUI = 2, ///< The Windows GUI subsystem.
     IMAGE_SUBSYSTEM_WINDOWS_CUI = 3, ///< The Windows character subsystem.
+    IMAGE_SUBSYSTEM_OS2_CUI = 5, ///< The OS/2 character subsytem.
     IMAGE_SUBSYSTEM_POSIX_CUI = 7, ///< The POSIX character subsystem.
+    IMAGE_SUBSYSTEM_NATIVE_WINDOWS = 8, ///< Native Windows 9x driver.
     IMAGE_SUBSYSTEM_WINDOWS_CE_GUI = 9, ///< Windows CE.
     IMAGE_SUBSYSTEM_EFI_APPLICATION = 10, ///< An EFI application.
     IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER = 11, ///< An EFI driver with boot
@@ -519,7 +521,8 @@ namespace COFF {
     IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER = 12, ///< An EFI driver with run-time
                                              ///  services.
     IMAGE_SUBSYSTEM_EFI_ROM = 13, ///< An EFI ROM image.
-    IMAGE_SUBSYSTEM_XBOX = 14 ///< XBOX.
+    IMAGE_SUBSYSTEM_XBOX = 14, ///< XBOX.
+    IMAGE_SUBSYSTEM_WINDOWS_BOOT_APPLICATION = 16, ///< A BCD application.
   };
 
   enum DLLCharacteristics {