1 files changed, 1 insertions, 0 deletions
diff --git a/cont.c b/cont.c
index f7a9057f65..490ffac80b 100644
--- a/cont.c
+++ b/cont.c
@@ -139,6 +139,7 @@ cont_mark(void *ptr)
 	rb_context_t *cont = ptr;
 	rb_gc_mark(cont->value);
 	rb_thread_mark(&cont->saved_thread);
+	rb_gc_mark(cont->saved_thread.self);
 
 	if (cont->vm_stack) {
 #ifdef CAPTURE_JUST_VALID_VM_STACK