diff --git a/internal.h b/internal.h index cda4118728..b555bbab06 100644 --- a/internal.h +++ b/internal.h @@ -1249,7 +1249,7 @@ NORETURN(void ruby_deprecated_internal_feature(const char *)); #define DEPRECATED_INTERNAL_FEATURE(func) \ (ruby_deprecated_internal_feature(func), UNREACHABLE) VALUE rb_warning_warn(VALUE mod, VALUE str); -VALUE rb_warning_string(const char *fmt, ...); +PRINTF_ARGS(VALUE rb_warning_string(const char *fmt, ...), 1, 2); /* eval.c */ VALUE rb_refinement_module_get_refined_class(VALUE module);