diff --git a/api/client/utils.go b/api/client/utils.go
index f330a6840e..6ebe448062 100644
--- a/api/client/utils.go
+++ b/api/client/utils.go
@@ -260,7 +260,7 @@ func (cli *DockerCli) monitorTtySize(id string, isExec bool) error {
 	sigchan := make(chan os.Signal, 1)
 	gosignal.Notify(sigchan, signal.SIGWINCH)
 	go func() {
-		for _ := range sigchan {
+		for _ = range sigchan {
 			cli.resizeTty(id, isExec)
 		}
 	}()