diff --git a/ssl/tls13_enc.cc b/ssl/tls13_enc.cc
index b68a39e..854fae0 100644
--- a/ssl/tls13_enc.cc
+++ b/ssl/tls13_enc.cc
@@ -57,7 +57,7 @@
 
 int tls13_init_early_key_schedule(SSL_HANDSHAKE *hs) {
   SSL *const ssl = hs->ssl;
-  return init_key_schedule(hs, SSL_SESSION_protocol_version(ssl->session),
+  return init_key_schedule(hs, ssl_session_protocol_version(ssl->session),
                            ssl->session->cipher);
 }
 
@@ -116,7 +116,7 @@
                           const uint8_t *traffic_secret,
                           size_t traffic_secret_len) {
   const SSL_SESSION *session = SSL_get_session(ssl);
-  uint16_t version = SSL_SESSION_protocol_version(session);
+  uint16_t version = ssl_session_protocol_version(session);
 
   if (traffic_secret_len > 0xff) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
@@ -131,7 +131,7 @@
     return 0;
   }
 
-  const EVP_MD *digest = SSL_SESSION_get_digest(session);
+  const EVP_MD *digest = ssl_session_get_digest(session);
 
   // Derive the key.
   size_t key_len = EVP_AEAD_key_length(aead);
@@ -253,7 +253,7 @@
     secret_len = ssl->s3->write_traffic_secret_len;
   }
 
-  const EVP_MD *digest = SSL_SESSION_get_digest(SSL_get_session(ssl));
+  const EVP_MD *digest = ssl_session_get_digest(SSL_get_session(ssl));
   if (!hkdf_expand_label(secret, digest, secret, secret_len,
                          (const uint8_t *)kTLS13LabelApplicationTraffic,
                          strlen(kTLS13LabelApplicationTraffic), NULL, 0,
@@ -328,7 +328,7 @@
     hash_len = context_len;
   }
 
-  const EVP_MD *digest = SSL_SESSION_get_digest(SSL_get_session(ssl));
+  const EVP_MD *digest = ssl_session_get_digest(SSL_get_session(ssl));
   return hkdf_expand_label(out, digest, ssl->s3->exporter_secret,
                            ssl->s3->exporter_secret_len, (const uint8_t *)label,
                            label_len, hash, hash_len, out_len);
@@ -368,7 +368,7 @@
 
 int tls13_write_psk_binder(SSL_HANDSHAKE *hs, uint8_t *msg, size_t len) {
   SSL *const ssl = hs->ssl;
-  const EVP_MD *digest = SSL_SESSION_get_digest(ssl->session);
+  const EVP_MD *digest = ssl_session_get_digest(ssl->session);
   size_t hash_len = EVP_MD_size(digest);
 
   if (len < hash_len + 3) {