1 files changed, 1 insertions, 0 deletions
diff --git a/thread.c b/thread.c
index c756b53bea..51710d24a7 100644
--- a/thread.c
+++ b/thread.c
@@ -4396,6 +4396,7 @@ rb_thread_atfork_internal(rb_thread_t *th, void (*atfork)(rb_thread_t *, const r
     vm->main_thread = th;
 
     gvl_atfork(th->vm);
+    ubf_list_atfork();
 
     list_for_each(&vm->living_threads, i, vmlt_node) {
 	atfork(i, th);