1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index a9f50a5..5f79d4e 100644
--- a/internal.h
+++ b/internal.h
@@ -778,6 +778,7 @@ size_t rb_big_size(VALUE);
 VALUE rb_integer_float_cmp(VALUE x, VALUE y);
 VALUE rb_integer_float_eq(VALUE x, VALUE y);
 VALUE rb_cstr_parse_inum(const char *str, ssize_t len, char **endp, int base);
+VALUE rb_big_abs(VALUE x);
 
 /* class.c */
 VALUE rb_class_boot(VALUE);