diff --git a/api/client/utils.go b/api/client/utils.go
index e03ec5ffaa..fd26f746c3 100644
--- a/api/client/utils.go
+++ b/api/client/utils.go
@@ -43,7 +43,7 @@ func (cli *DockerCli) resizeTty(id string, isExec bool) {
 	}
 
 	var err error
-	if !isExec {
+	if isExec {
 		err = cli.client.ContainerExecResize(options)
 	} else {
 		err = cli.client.ContainerResize(options)