1 files changed, 2 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 6926debf7c..82890b04da 100644
--- a/internal.h
+++ b/internal.h
@@ -178,6 +178,8 @@ VALUE num_interval_step_size(VALUE from, VALUE to, VALUE step, int excl);
 int ruby_float_step(VALUE from, VALUE to, VALUE step, int excl);
 double ruby_float_mod(double x, double y);
 int rb_num_negative_p(VALUE);
+VALUE rb_int_succ(VALUE num);
+VALUE rb_int_pred(VALUE num);
 
 /* object.c */
 VALUE rb_obj_equal(VALUE obj1, VALUE obj2);