1 files changed, 1 insertions, 0 deletions
diff --git a/cont.c b/cont.c
index ad277bda1d..9a0593c21e 100644
--- a/cont.c
+++ b/cont.c
@@ -383,6 +383,7 @@ cont_init(rb_context_t *cont, rb_thread_t *th)
     /* save thread context */
     cont->saved_thread = *th;
     cont->saved_thread.local_storage = 0;
+    cont->saved_thread.machine_stack_start = cont->saved_thread.machine_stack_end = 0;
 }
 
 static rb_context_t *