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-rw-r--r--mrbgems/mruby-kernel-ext/src/kernel.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-kernel-ext/src/kernel.c b/mrbgems/mruby-kernel-ext/src/kernel.c
index 1ce63ac94..a6ecd72bd 100644
--- a/mrbgems/mruby-kernel-ext/src/kernel.c
+++ b/mrbgems/mruby-kernel-ext/src/kernel.c
@@ -26,7 +26,7 @@ mrb_mruby_kernel_ext_gem_init(mrb_state *mrb)
{
struct RClass *krn = mrb->kernel_module;
- mrb_define_module_function(mrb, krn, "fail", mrb_f_raise, MRB_ARGS_NONE());
+ mrb_define_module_function(mrb, krn, "fail", mrb_f_raise, MRB_ARGS_OPT(2));
mrb_define_method(mrb, krn, "__method__", mrb_f_method, MRB_ARGS_NONE());
}