diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 89cc0f2..3759f5e 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -66,7 +66,6 @@ vm_push_frame(rb_thread_t *th,
     cfp->iseq = (rb_iseq_t *) iseq;
     cfp->flag = type;
     cfp->self = self;
-    cfp->block_iseq = 0;
     cfp->proc = 0;
     cfp->me = me;
     if (klass) {