diff --git a/stage23/menu.c b/stage23/menu.c
index a4617676..b0f6b60c 100644
--- a/stage23/menu.c
+++ b/stage23/menu.c
@@ -831,6 +831,7 @@ timeout_aborted:
                 goto refresh;
             case GETCHAR_CURSOR_RIGHT:
             case '\n':
+            case ' ':
             autoboot:
                 if (selected_menu_entry->sub != NULL) {
                     selected_menu_entry->expanded = !selected_menu_entry->expanded;