diff --git a/test/init_mrbtest.c b/test/init_mrbtest.c
index cc75a5a5e..2a32f4930 100644
--- a/test/init_mrbtest.c
+++ b/test/init_mrbtest.c
@@ -31,5 +31,6 @@ mrb_init_mrbtest(mrb_state *mrb)
     mrb_print_error(mrb);
     exit(EXIT_FAILURE);
   }
+  mrb_close(core_test);
 }