1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index e68e078e86..2f8c26f9e4 100644
--- a/internal.h
+++ b/internal.h
@@ -1014,6 +1014,7 @@ VALUE rb_int_mul(VALUE x, VALUE y);
 VALUE rb_int_idiv(VALUE x, VALUE y);
 VALUE rb_int_modulo(VALUE x, VALUE y);
 VALUE rb_int_round(VALUE num, int ndigits);
+VALUE rb_int2str(VALUE num, int base);
 VALUE rb_dbl_hash(double d);
 VALUE rb_fix_plus(VALUE x, VALUE y);