diff --git a/src/syscall/mkall.sh b/src/syscall/mkall.sh
index 826512a177..2c2fc453d3 100755
--- a/src/syscall/mkall.sh
+++ b/src/syscall/mkall.sh
@@ -124,14 +124,12 @@ aix_ppc64)
 darwin_amd64)
 	mkerrors="$mkerrors -m64"
 	mksyscall="./mksyscall.pl -darwin"
-	mksysnum="./mksysnum_darwin.pl /usr/include/sys/syscall.h"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	mkasm="go run mkasm_darwin.go"
 	;;
 darwin_arm64)
 	mkerrors="$mkerrors -m64"
 	mksyscall="./mksyscall.pl -darwin"
-	mksysnum="./mksysnum_darwin.pl /usr/include/sys/syscall.h"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	mkasm="go run mkasm_darwin.go"
 	;;
diff --git a/src/syscall/mksysnum_darwin.pl b/src/syscall/mksysnum_darwin.pl
deleted file mode 100755
index af21e855ae..0000000000
--- a/src/syscall/mksysnum_darwin.pl
+++ /dev/null
@@ -1,32 +0,0 @@
-#!/usr/bin/env perl
-# Copyright 2009 The Go Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
-#
-# Generate system call table for Darwin from sys/syscall.h
-
-use strict;
-
-my $command = "mksysnum_darwin.pl " . join(' ', @ARGV);
-
-print <<EOF;
-// $command
-// Code generated by the command above; DO NOT EDIT.
-
-package syscall
-
-const (
-EOF
-
-while(<>){
-	if(/^#define\s+SYS_(\w+)\s+([0-9]+)/){
-		my $name = $1;
-		my $num = $2;
-		$name =~ y/a-z/A-Z/;
-		print "	SYS_$name = $num;"
-	}
-}
-
-print <<EOF;
-)
-EOF