diff --git a/plan9/asm_plan9_amd64.s b/plan9/asm_plan9_amd64.s
deleted file mode 100644
index d3448e675..000000000
--- a/plan9/asm_plan9_amd64.s
+++ /dev/null
@@ -1,30 +0,0 @@
-// 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.
-
-#include "textflag.h"
-
-//
-// System call support for amd64, Plan 9
-//
-
-// Just jump to package syscall's implementation for all these functions.
-// The runtime may know about them.
-
-TEXT	·Syscall(SB),NOSPLIT,$0-64
-	JMP	syscall·Syscall(SB)
-
-TEXT	·Syscall6(SB),NOSPLIT,$0-88
-	JMP	syscall·Syscall6(SB)
-
-TEXT ·RawSyscall(SB),NOSPLIT,$0-56
-	JMP	syscall·RawSyscall(SB)
-
-TEXT	·RawSyscall6(SB),NOSPLIT,$0-80
-	JMP	syscall·RawSyscall6(SB)
-
-TEXT ·seek(SB),NOSPLIT,$0-56
-	JMP	syscall·seek(SB)
-
-TEXT ·exit(SB),NOSPLIT,$8-8
-	JMP	syscall·exit(SB)
diff --git a/plan9/syscall_plan9.go b/plan9/syscall_plan9.go
index 761912237..a04574f38 100644
--- a/plan9/syscall_plan9.go
+++ b/plan9/syscall_plan9.go
@@ -13,6 +13,7 @@ package plan9
 
 import (
 	"bytes"
+	"os"
 	"syscall"
 	"unsafe"
 )
@@ -61,10 +62,10 @@ func errstr() string {
 	return cstring(buf[:])
 }
 
-// Implemented in assembly to import from runtime.
-func exit(code int)
-
-func Exit(code int) { exit(code) }
+// Exit causes the current process to exit with the given status code.
+// Previously implemented in assembly referencing syscall.exit, which does
+// not exist on Plan 9, causing build failures on plan9/amd64.
+func Exit(code int) { os.Exit(code) }
 
 func readnum(path string) (uint, error) {
 	var b [12]byte