1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 15cad55c20..77fad73f72 100644
--- a/internal.h
+++ b/internal.h
@@ -1204,6 +1204,7 @@ rb_pid_t rb_fork_ruby(int *status);
 void rb_last_status_clear(void);
 
 /* rational.c */
+VALUE rb_rational_add(VALUE self, VALUE other);
 VALUE rb_lcm(VALUE x, VALUE y);
 VALUE rb_rational_reciprocal(VALUE x);
 VALUE rb_cstr_to_rat(const char *, int);