1 files changed, 1 insertions, 0 deletions
diff --git a/vm.c b/vm.c
index 980e7eab9f..9e7087af04 100644
--- a/vm.c
+++ b/vm.c
@@ -1644,6 +1644,7 @@ rb_thread_mark(void *ptr)
 	    while (cfp != limit_cfp) {
 		rb_iseq_t *iseq = cfp->iseq;
 		rb_gc_mark(cfp->proc);
+		rb_gc_mark(cfp->self);
 		if (iseq) {
 		    rb_gc_mark(RUBY_VM_NORMAL_ISEQ_P(iseq) ? iseq->self : (VALUE)iseq);
 		}