Using UNDEF_P macro

1 files changed, 3 insertions, 3 deletions

diff --git a/marshal.c b/marshal.c
index d956260d96..e1612303fe 100644
--- a/marshal.c
+++ b/marshal.c
@@ -743,7 +743,7 @@ w_ivar(st_index_t num, VALUE ivobj, VALUE encname, struct dump_call_arg *arg)
         w_object(Qtrue, arg->arg, limit);
         num--;
     }
-    if (ivobj != Qundef && num) {
+    if (!UNDEF_P(ivobj) && num) {
         w_ivar_each(ivobj, num, arg);
     }
 }
@@ -930,7 +930,7 @@ w_object(VALUE obj, struct dump_arg *arg, int limit)
                     arg->compat_tbl = rb_init_identtable();
                 }
                 st_insert(arg->compat_tbl, (st_data_t)obj, (st_data_t)real_obj);
-                if (obj != real_obj && ivobj == Qundef) hasiv = 0;
+                if (obj != real_obj && UNDEF_P(ivobj)) hasiv = 0;
             }
         }
         if (hasiv) w_byte(TYPE_IVAR, arg);
@@ -2251,7 +2251,7 @@ r_object_for(struct load_arg *arg, bool partial, int *ivp, VALUE extmod, int typ
         break;
     }
 
-    if (v == Qundef) {
+    if (UNDEF_P(v)) {
         rb_raise(rb_eArgError, "dump format error (bad link)");
     }