1 files changed, 1 insertions, 0 deletions

diff --git a/arith.h b/arith.h
index 1b4026b1..b5ad0472 100644
--- a/arith.h
+++ b/arith.h
@@ -25,5 +25,6 @@
  */
 
 val make_bignum(void);
+int highest_bit(int_ptr_t n);
 val normalize(val bignum);
 void arith_init(void);