1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index b5871fcd55..e66b5fd038 100644
--- a/internal.h
+++ b/internal.h
@@ -168,6 +168,7 @@ int rb_num_to_uint(VALUE val, unsigned int *ret);
 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);
 
 /* object.c */
 VALUE rb_obj_equal(VALUE obj1, VALUE obj2);