Using UNDEF_P macro

1 files changed, 1 insertions, 1 deletions

diff --git a/vm_exec.c b/vm_exec.c
index 0f59d08b96..36bacfd5e8 100644
--- a/vm_exec.c
+++ b/vm_exec.c
@@ -183,7 +183,7 @@ vm_exec_core(rb_execution_context_t *ec, VALUE initial)
         }
     }
 
-    if ((th = rb_ec_thread_ptr(ec))->retval != Qundef) {
+    if (!UNDEF_P((th = rb_ec_thread_ptr(ec))->retval)) {
         VALUE ret = th->retval;
         th->retval = Qundef;
         return ret;