diff --git a/mrbgems/mruby-struct/src/struct.c b/mrbgems/mruby-struct/src/struct.c
index 918a8abc4..1e04998fd 100644
--- a/mrbgems/mruby-struct/src/struct.c
+++ b/mrbgems/mruby-struct/src/struct.c
@@ -393,12 +393,11 @@ mrb_struct_initialize(mrb_state *mrb, mrb_value self)
 {
   const mrb_value *argv;
   mrb_int argc;
-  mrb_value klass, keyword_init;
 
   mrb_get_args(mrb, "*", &argv, &argc);
 
-  klass = mrb_obj_value(mrb_obj_class(mrb, self));
-  keyword_init = mrb_iv_get(mrb, klass, MRB_IVSYM(__keyword_init__));
+  mrb_value klass = mrb_obj_value(mrb_obj_class(mrb, self));
+  mrb_value keyword_init = mrb_iv_get(mrb, klass, MRB_IVSYM(__keyword_init__));
 
   if (mrb_test(keyword_init)) { /* keyword_init: true or other truthy value */
     if (argc > 1 || (argc == 1 && !mrb_hash_p(argv[0]))) {