diff --git a/src/os/os_test.go b/src/os/os_test.go
index dbe4ff8830..c807786310 100644
--- a/src/os/os_test.go
+++ b/src/os/os_test.go
@@ -1014,9 +1014,14 @@ func TestStartProcess(t *testing.T) {
 		dir = Getenv("SystemRoot")
 		args = []string{"/c", "cd"}
 	default:
-		cmd = "/bin/pwd"
+		var err error
+		cmd, err = osexec.LookPath("pwd")
+		if err != nil {
+			t.Fatalf("Can't find pwd: %v", err)
+		}
 		dir = "/"
 		args = []string{}
+		t.Logf("Testing with %v", cmd)
 	}
 	cmddir, cmdbase := filepath.Split(cmd)
 	args = append([]string{cmdbase}, args...)