1 files changed, 1 insertions, 1 deletions
diff --git a/thread.c b/thread.c
index 6cf6d52727..c50cedc4b1 100644
--- a/thread.c
+++ b/thread.c
@@ -580,7 +580,7 @@ thread_start_func_2(rb_thread_t *th, VALUE *stack_start, VALUE *register_stack_s
 		    GetProcPtr(th->first_proc, proc);
 		    th->errinfo = Qnil;
 		    th->root_lep = rb_vm_ep_local_ep(proc->block.ep);
-		    th->root_svar = Qnil;
+		    th->root_svar = Qfalse;
 		    EXEC_EVENT_HOOK(th, RUBY_EVENT_THREAD_BEGIN, th->self, 0, 0, Qundef);
 		    th->value = rb_vm_invoke_proc(th, proc, (int)RARRAY_LEN(args), RARRAY_CONST_PTR(args), 0);
 		    EXEC_EVENT_HOOK(th, RUBY_EVENT_THREAD_END, th->self, 0, 0, Qundef);