diff --git a/src/gc.c b/src/gc.c
index bb5c00287..1b467c6a7 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -467,7 +467,7 @@ mrb_gc_unregister(mrb_state *mrb, mrb_value obj)
 MRB_API struct RBasic*
 mrb_obj_alloc(mrb_state *mrb, enum mrb_vtype ttype, struct RClass *cls)
 {
-  static const RVALUE RVALUE_zero = { { { NULL, NULL, MRB_TT_FALSE } } };
+  static const RVALUE RVALUE_zero = { { { NULL, MRB_TT_FALSE } } };
   mrb_gc *gc = &mrb->gc;
 
   if (cls) {