diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index 44cc7cc..d4ebcba 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -1238,7 +1238,7 @@
 #define PSA_ASYMMETRIC_SIGN_OUTPUT_SIZE(key_type, key_bits, alg)        \
     (PSA_KEY_TYPE_IS_RSA(key_type) ? ((void)alg, PSA_BITS_TO_BYTES(key_bits)) : \
      PSA_KEY_TYPE_IS_ECC(key_type) ? PSA_ECDSA_SIGNATURE_SIZE(key_bits) : \
-     0)
+     ((void)alg, 0))
 
 /**
  * \brief Sign a hash or short message with a private key.
@@ -1261,8 +1261,6 @@
  * \param signature_size    Size of the \c signature buffer in bytes.
  * \param signature_length  On success, the number of bytes
  *                          that make up the returned signature value.
- *                          This is at most #PSA_HASH_FINAL_SIZE(alg)
- *                          (note that it may be less).
  *
  * \retval PSA_SUCCESS
  * \retval PSA_ERROR_BUFFER_TOO_SMALL