diff --git a/DuetPkg/BootSector/BootSector.inf b/DuetPkg/BootSector/BootSector.inf
index e193adb4a6..e42d97281d 100644
--- a/DuetPkg/BootSector/BootSector.inf
+++ b/DuetPkg/BootSector/BootSector.inf
@@ -6,8 +6,9 @@
   VERSION_STRING                 = 1.0
   EDK_RELEASE_VERSION            = 0x00020000
   EFI_SPECIFICATION_VERSION      = 0x00020000
-  CUSTOM_MAKEFILE                = Makefile
-  
+  CUSTOM_MAKEFILE                = MSFT|Makefile
+  CUSTOM_MAKEFILE                = GCC|GnuMakefile
+
 [Packages]
   MdePkg/MdePkg.dec
   DuetPkg/DuetPkg.dec
diff --git a/DuetPkg/BootSector/GnuMakefile b/DuetPkg/BootSector/GnuMakefile
new file mode 100644
index 0000000000..1263948fb8
--- /dev/null
+++ b/DuetPkg/BootSector/GnuMakefile
@@ -0,0 +1 @@
+all: