1 files changed, 3 insertions, 0 deletions
diff --git a/bignum.h b/bignum.h
index b4cfcc37..c26d1847 100644
--- a/bignum.h
+++ b/bignum.h
@@ -29,6 +29,9 @@
 #include <gmp.h>
 #include <inttypes.h>
 
+unsigned
+nettle_mpz_sizeinbase_256(const mpz_t x);
+
 /* Writes an unsigned integer as length octets, using big endian byte
  * order. */
 void