diff --git a/src/pkg/os/exec_unix.go b/src/pkg/os/exec_unix.go
index a5c2281..b9880ff 100644
--- a/src/pkg/os/exec_unix.go
+++ b/src/pkg/os/exec_unix.go
@@ -12,43 +12,23 @@
 	"syscall"
 )
 
-// Options for Wait.
-const (
-	WNOHANG   = syscall.WNOHANG   // Don't wait if no process has exited.
-	WSTOPPED  = syscall.WSTOPPED  // If set, status of stopped subprocesses is also reported.
-	WUNTRACED = syscall.WUNTRACED // Usually an alias for WSTOPPED.
-	WRUSAGE   = 1 << 20           // Record resource usage.
-)
-
-// WRUSAGE must not be too high a bit, to avoid clashing with Linux's
-// WCLONE, WALL, and WNOTHREAD flags, which sit in the top few bits of
-// the options
-
 // Wait waits for the Process to exit or stop, and then returns a
-// Waitmsg describing its status and an error, if any. The options
-// (WNOHANG etc.) affect the behavior of the Wait call.
-func (p *Process) Wait(options int) (w *Waitmsg, err error) {
+// Waitmsg describing its status and an error, if any.
+func (p *Process) Wait() (w *Waitmsg, err error) {
 	if p.Pid == -1 {
 		return nil, syscall.EINVAL
 	}
 	var status syscall.WaitStatus
-	var rusage *syscall.Rusage
-	if options&WRUSAGE != 0 {
-		rusage = new(syscall.Rusage)
-		options ^= WRUSAGE
-	}
-	pid1, e := syscall.Wait4(p.Pid, &status, options, rusage)
+	pid1, e := syscall.Wait4(p.Pid, &status, 0, nil)
 	if e != nil {
 		return nil, NewSyscallError("wait", e)
 	}
-	// With WNOHANG pid is 0 if child has not exited.
-	if pid1 != 0 && options&WSTOPPED == 0 {
+	if pid1 != 0 {
 		p.done = true
 	}
 	w = new(Waitmsg)
 	w.Pid = pid1
 	w.WaitStatus = status
-	w.Rusage = rusage
 	return w, nil
 }