1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 350504646d..ec61b32ae7 100644
--- a/internal.h
+++ b/internal.h
@@ -76,6 +76,7 @@ void rb_gc_mark_encodings(void);
 /* error.c */
 NORETURN(PRINTF_ARGS(void rb_compile_bug(const char*, int, const char*, ...), 3, 4));
 VALUE rb_check_backtrace(VALUE);
+NORETURN(void rb_async_bug_errno(const char *,int));
 
 /* eval_error.c */
 void ruby_error_print(void);