@@ -1448,10 +1448,16 @@ func (s *DockerSuite) TestRunResolvconfUpdate(c *check.C) {

 	// This test case is meant to test monitoring resolv.conf when it is

 	// a regular file not a bind mounc. So we unmount resolv.conf and replace

 	// it with a file containing the original settings.

-	cmd := exec.Command("umount", "/etc/resolv.conf")

-	if _, err = runCommand(cmd); err != nil {

+	mounted, err := mount.Mounted("/etc/resolv.conf")

+	if err != nil {

 		c.Fatal(err)

 	}

+	if mounted {

+		cmd := exec.Command("umount", "/etc/resolv.conf")

+		if _, err = runCommand(cmd); err != nil {

+			c.Fatal(err)

+		}

+	}

 	//cleanup

 	defer func() {