diff --git a/src/bfu/listmenu.c b/src/bfu/listmenu.c
index a28df0d9..31cf654d 100644
--- a/src/bfu/listmenu.c
+++ b/src/bfu/listmenu.c
@@ -169,15 +169,14 @@ destroy_menu(struct list_menu *menu)
 }
 
 void
-menu_labels(struct menu_item *items, char *base, char **lbls)
+menu_labels(struct menu_item *items, const char *base, char **lbls)
 {
 	struct menu_item *item;
 	char *bs;
 
 	foreach_menu_item (item, items) {
-		bs = (item->flags & MENU_FULLNAME) ? (char *) ""
-						   : base;
-		bs = straconcat(bs, item->text, (char *) NULL);
+		const char *bs2 = (item->flags & MENU_FULLNAME) ? "" : base;
+		bs = straconcat(bs2, item->text, (char *) NULL);
 		if (!bs) continue;
 
 		if (item->func == do_select_submenu) {
diff --git a/src/bfu/listmenu.h b/src/bfu/listmenu.h
index 9fcee17b..cf9ab5d2 100644
--- a/src/bfu/listmenu.h
+++ b/src/bfu/listmenu.h
@@ -20,7 +20,7 @@ void destroy_menu(struct list_menu *menu);
 void add_select_item(struct list_menu *menu, struct string *string, struct string *orig_string, char **value, int order, int dont_add);
 void new_menu_item(struct list_menu *menu, char *name, int data, int fullname);
 struct menu_item *detach_menu(struct list_menu *menu);
-void menu_labels(struct menu_item *m, char *base, char **lbls);
+void menu_labels(struct menu_item *m, const char *base, char **lbls);
 void do_select_submenu(struct terminal *term, void *menu_, void *ses_);
 void free_menu(struct menu_item *m);