1 files changed, 1 insertions, 0 deletions
diff --git a/inits.c b/inits.c
index f41e88d838..22ba6d5a8c 100644
--- a/inits.c
+++ b/inits.c
@@ -98,6 +98,7 @@ rb_call_builtin_inits(void)
     BUILTIN(array);
     BUILTIN(kernel);
     BUILTIN(timev);
+    BUILTIN(thread_sync);
     BUILTIN(yjit);
     BUILTIN(nilclass);
     BUILTIN(marshal);