1 files changed, 1 insertions, 0 deletions
diff --git a/thread.c b/thread.c
index 9c4c6da18b..dad5c1c286 100644
--- a/thread.c
+++ b/thread.c
@@ -2371,6 +2371,7 @@ rb_thread_reset_timer_thread(void)
 void
 rb_thread_start_timer_thread(void)
 {
+    system_working = 1;
     rb_thread_create_timer_thread();
 }