diff --git a/src/runtime/testdata/testprog/syscalls_linux.go b/src/runtime/testdata/testprog/syscalls_linux.go
index 48f80142374..3939b160df6 100644
--- a/src/runtime/testdata/testprog/syscalls_linux.go
+++ b/src/runtime/testdata/testprog/syscalls_linux.go
@@ -7,6 +7,7 @@ package main
 import (
 	"bytes"
 	"fmt"
+	"internal/testenv"
 	"os"
 	"syscall"
 )
@@ -44,11 +45,8 @@ func getcwd() (string, error) {
 
 func unshareFs() error {
 	err := syscall.Unshare(syscall.CLONE_FS)
-	if err != nil {
-		errno, ok := err.(syscall.Errno)
-		if ok && errno == syscall.EPERM {
-			return errNotPermitted
-		}
+	if testenv.SyscallIsNotSupported(err) {
+		return errNotPermitted
 	}
 	return err
 }