diff --git a/util/autoport/main.go b/util/autoport/main.go
index ed7cb0e841..4f5543bf4b 100644
--- a/util/autoport/main.go
+++ b/util/autoport/main.go
@@ -739,7 +739,7 @@ func main() {
 	}
 
 	if len(BootBlockFiles) > 0 || len(ROMStageFiles) > 0 || len(RAMStageFiles) > 0 || len(SMMFiles) > 0 {
-		mf := Create(ctx, "Makefile.inc")
+		mf := Create(ctx, "Makefile.mk")
 		defer mf.Close()
 		writeMF(mf, BootBlockFiles, "bootblock")
 		writeMF(mf, ROMStageFiles, "romstage")
diff --git a/util/autoport/readme.md b/util/autoport/readme.md
index 907d6009db..b546120fca 100644
--- a/util/autoport/readme.md
+++ b/util/autoport/readme.md
@@ -238,7 +238,7 @@ to create a binary file with this SPD data:
 
 Then, move the generated file into your mainboard's directory
 and hook it up to the build system by adding the following
-lines to `Makefile.inc`:
+lines to `Makefile.mk`:
 
 	cbfs-files-y += spd.bin
 	spd.bin-file := spd.bin