diff --git a/eval.c b/eval.c
index b201121fc2de82..52f3cc4e9fff81 100644
--- a/eval.c
+++ b/eval.c
@@ -88,10 +88,8 @@ ruby_setup(void)
 
     EC_PUSH_TAG(GET_EC());
     if ((state = EC_EXEC_TAG()) == TAG_NONE) {
-        rb_gc_disable();
 	rb_call_inits();
 	ruby_prog_init();
-        rb_gc_enable();
 	GET_VM()->running = 1;
     }
     EC_POP_TAG();
diff --git a/inits.c b/inits.c
index ad57b754a462d4..976cb223ec840a 100644
--- a/inits.c
+++ b/inits.c
@@ -20,6 +20,7 @@ static void Init_builtin_prelude(void);
 void
 rb_call_inits(void)
 {
+    CALL(Thread_Mutex);
 #if USE_TRANSIENT_HEAP
     CALL(TransientHeap);
 #endif
diff --git a/thread.c b/thread.c
index e463b72a41925f..8980c8cc597e9c 100644
--- a/thread.c
+++ b/thread.c
@@ -5255,6 +5255,16 @@ rb_thread_backtrace_locations_m(int argc, VALUE *argv, VALUE thval)
     return rb_vm_thread_backtrace_locations(argc, argv, thval);
 }
 
+void
+Init_Thread_Mutex()
+{
+    rb_thread_t *th = GET_THREAD();
+
+    rb_native_mutex_initialize(&th->vm->waitpid_lock);
+    rb_native_mutex_initialize(&th->vm->workqueue_lock);
+    rb_native_mutex_initialize(&th->interrupt_lock);
+}
+
 /*
  *  Document-class: ThreadError
  *
@@ -5374,9 +5384,6 @@ Init_Thread(void)
 	    /* acquire global vm lock */
 	    gvl_init(th->vm);
 	    gvl_acquire(th->vm, th);
-            rb_native_mutex_initialize(&th->vm->waitpid_lock);
-            rb_native_mutex_initialize(&th->vm->workqueue_lock);
-            rb_native_mutex_initialize(&th->interrupt_lock);
 
 	    th->pending_interrupt_queue = rb_ary_tmp_new(0);
 	    th->pending_interrupt_queue_checked = 0;