diff --git a/src/enum.c b/src/enum.c
index 08b90d051..c2720bf78 100644
--- a/src/enum.c
+++ b/src/enum.c
@@ -25,7 +25,6 @@ enum_update_hash(mrb_state *mrb, mrb_value self)
 void
 mrb_init_enumerable(mrb_state *mrb)
 {
-  struct RClass *enumerable;
-  enumerable = mrb_define_module_id(mrb, MRB_SYM(Enumerable));  /* 15.3.2 */
+  struct RClass *enumerable = mrb_define_module_id(mrb, MRB_SYM(Enumerable));  /* 15.3.2 */
   mrb_define_module_function_id(mrb, enumerable, MRB_SYM(__update_hash), enum_update_hash, MRB_ARGS_REQ(3));
 }