diff --git a/libmenu/menu_list.c b/libmenu/menu_list.c
index 0f7b0d8325..0b0a894555 100644
--- a/libmenu/menu_list.c
+++ b/libmenu/menu_list.c
@@ -137,7 +137,7 @@ void menu_list_read_cmd(menu_t* menu,int cmd) {
 }
 
 void menu_list_jump_to_key(menu_t* menu,int c) {
-  if(isalnum(c)) {
+  if(c < 256 && isalnum(c)) {
     list_entry_t* e = mpriv->current;
     if(e->txt[0] == c) e = e->next;
     for(  ; e ; e = e->next) {