1 files changed, 1 insertions, 0 deletions
diff --git a/thread.c b/thread.c
index bcabb59ec..2f1ff92e8 100644
--- a/thread.c
+++ b/thread.c
@@ -2008,6 +2008,7 @@ rb_thread_stop_timer_thread(void)
     if (timer_thread_id) {
 	system_working = 0;
 	native_thread_join(timer_thread_id);
+	timer_thread_id = 0;
     }
 }