diff --git a/thread_pthread.c b/thread_pthread.c
index 4a240f4fbe1224..cae4a8e1bd4b66 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -593,8 +593,16 @@ thread_sched_setup_running_threads(struct rb_thread_sched *sched, rb_ractor_t *c
 
     if (add_th && !del_th && UNLIKELY(vm->ractor.sync.lock_owner != NULL)) {
         // it can be after barrier synchronization by another ractor
-        RB_VM_LOCK_ENTER();
-        RB_VM_LOCK_LEAVE();
+        rb_thread_t *lock_owner = NULL;
+#if VM_CHECK_MODE
+        lock_owner = sched->lock_owner;
+#endif
+        thread_sched_unlock(sched, lock_owner);
+        {
+            RB_VM_LOCK_ENTER();
+            RB_VM_LOCK_LEAVE();
+        }
+        thread_sched_lock(sched, lock_owner);
     }
 
     //RUBY_DEBUG_LOG("+:%u -:%u +ts:%u -ts:%u run:%u->%u",