diff --git a/src/util/crypto.c b/src/util/crypto.c
index fb90dfe6c..c63a3d353 100644
--- a/src/util/crypto.c
+++ b/src/util/crypto.c
@@ -183,7 +183,7 @@ TALER_setup_fresh_coin (const struct TALER_TransferSecretP *secret_seed,
                         struct TALER_FreshCoinP *fc)
 {
   uint32_t be_salt = htonl (coin_num_salt);
-  unsigned char *p;
+  uint8_t *p;
 
   GNUNET_assert (GNUNET_OK ==
                  GNUNET_CRYPTO_kdf (fc,
@@ -199,7 +199,7 @@ TALER_setup_fresh_coin (const struct TALER_TransferSecretP *secret_seed,
   /* Taken from like 170-172 of libgcrypt/cipher/ecc.c
    * We note that libgcrypt stores the private key in the reverse order
    * from many Ed25519 implementatons. */
-  p = (char *) fc->coin_priv;  /*->key->bits; */
+  p = (uint8_t *) &(fc->coin_priv);
   p[0] &= 0x7f;  /* Clear bit 255. */
   p[0] |= 0x40;  /* Set bit 254.   */
   p[31] &= 0xf8; /* Clear bits 2..0 so that d mod 8 == 0  */