diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index 9c949bd..616d2ee 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -1948,6 +1948,11 @@
 
     MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse client hello"));
 
+    ret = mbedtls_ssl_tls13_crypto_init(ssl);
+    if (ret != 0) {
+        return ret;
+    }
+
     MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_tls13_fetch_handshake_msg(
                              ssl, MBEDTLS_SSL_HS_CLIENT_HELLO,
                              &buf, &buflen));