diff --git a/library/ssl_tls13_keys.c b/library/ssl_tls13_keys.c
index 2127393..5bd3e47 100644
--- a/library/ssl_tls13_keys.c
+++ b/library/ssl_tls13_keys.c
@@ -676,9 +676,9 @@
     MBEDTLS_SSL_DEBUG_BUF( 4, "handshake hash", transcript, transcript_len );
 
     if( from == MBEDTLS_SSL_IS_CLIENT )
-        base_key = ssl->handshake->tls1_3_hs_secrets.client_handshake_traffic_secret;
+        base_key = ssl->handshake->tls13_hs_secrets.client_handshake_traffic_secret;
     else
-        base_key = ssl->handshake->tls1_3_hs_secrets.server_handshake_traffic_secret;
+        base_key = ssl->handshake->tls13_hs_secrets.server_handshake_traffic_secret;
 
     ret = ssl_tls1_3_calc_finished_core( md_type, base_key, transcript, dst );
     if( ret != 0 )