diff --git a/commands.go b/commands.go
index cc123b44a2..67689dda82 100644
--- a/commands.go
+++ b/commands.go
@@ -648,22 +648,22 @@ func (srv *Server) CmdPs(stdin io.ReadCloser, stdout io.Writer, args ...string)
 	flAll := cmd.Bool("a", false, "Show all containers. Only running containers are shown by default.")
 	flFull := cmd.Bool("notrunc", false, "Don't truncate output")
 	latest := cmd.Bool("l", false, "Show only the latest created container, include non-running ones.")
-	n_last := cmd.Int("n", -1, "Show n last created containers, include non-running ones.")
+	nLast := cmd.Int("n", -1, "Show n last created containers, include non-running ones.")
 	if err := cmd.Parse(args); err != nil {
 		return nil
 	}
-	if *n_last == -1 && *latest {
-		*n_last = 1
+	if *nLast == -1 && *latest {
+		*nLast = 1
 	}
 	w := tabwriter.NewWriter(stdout, 12, 1, 3, ' ', 0)
 	if !*quiet {
 		fmt.Fprintln(w, "ID\tIMAGE\tCOMMAND\tCREATED\tSTATUS\tCOMMENT")
 	}
 	for i, container := range srv.runtime.List() {
-		if !container.State.Running && !*flAll && *n_last == -1{
+		if !container.State.Running && !*flAll && *nLast == -1 {
 			continue
 		}
-		if i == *n_last {
+		if i == *nLast {
 			break
 		}
 		if !*quiet {