@@ -424,7 +424,7 @@ func TestExecCgroup(t *testing.T) {

 	for i := 0; i < 5; i++ {

 		wg.Add(1)

 		go func() {

-			cmd = exec.Command(dockerBinary, "exec", "testing", "cat", "/proc/self/cgroup")

+			cmd := exec.Command(dockerBinary, "exec", "testing", "cat", "/proc/self/cgroup")

 			out, _, err := runCommandWithOutput(cmd)

 			if err != nil {

 				t.Fatal(out, err)