1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 64a67e194d..e5818429ea 100644
--- a/internal.h
+++ b/internal.h
@@ -136,6 +136,7 @@ void Init_newline(void);
 /* numeric.c */
 int rb_num_to_uint(VALUE val, unsigned int *ret);
 int ruby_float_step(VALUE from, VALUE to, VALUE step, int excl);
+double ruby_float_mod(double x, double y);
 
 /* object.c */
 VALUE rb_obj_equal(VALUE obj1, VALUE obj2);