diff --git a/vm_args.c b/vm_args.c
index 6cded80924..76516f60e0 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -725,7 +725,25 @@ raise_argument_error(rb_thread_t *th, const rb_iseq_t *iseq, const VALUE exc)
 static void
 argument_arity_error(rb_thread_t *th, const rb_iseq_t *iseq, const int miss_argc, const int min_argc, const int max_argc)
 {
-    raise_argument_error(th, iseq, rb_arity_error_new(miss_argc, min_argc, max_argc));
+    VALUE exc = rb_arity_error_new(miss_argc, min_argc, max_argc);
+    if (iseq->body->param.flags.has_kw) {
+   const struct rb_iseq_param_keyword *const kw = iseq->body->param.keyword;
+   const ID *keywords = kw->table;
+   int req_key_num = kw->required_num;
+   if (req_key_num > 0) {
+       VALUE mesg = rb_attr_get(exc, idMesg);
+       rb_str_resize(mesg, RSTRING_LEN(mesg)-1);
+       rb_str_cat_cstr(mesg, "; required keyword");
+       if (req_key_num > 1) rb_str_cat_cstr(mesg, "s");
+       do {
+       rb_str_cat_cstr(mesg, ": ");
+       rb_str_append(mesg, rb_id2str(*keywords++));
+       rb_str_cat_cstr(mesg, ",");
+       } while (--req_key_num);
+       RSTRING_PTR(mesg)[RSTRING_LEN(mesg)-1] = ')';
+   }
+    }
+    raise_argument_error(th, iseq, exc);
 }

 static void