diff --git a/src/ssl/handshake_server.c b/src/ssl/handshake_server.c
index 63027d6..4eaf3cb 100644
--- a/src/ssl/handshake_server.c
+++ b/src/ssl/handshake_server.c
@@ -1722,11 +1722,8 @@
       goto f_err;
     }
     hs->new_session->peer_signature_algorithm = signature_algorithm;
-  } else if (hs->peer_pubkey->type == EVP_PKEY_RSA) {
-    signature_algorithm = SSL_SIGN_RSA_PKCS1_MD5_SHA1;
-  } else if (hs->peer_pubkey->type == EVP_PKEY_EC) {
-    signature_algorithm = SSL_SIGN_ECDSA_SHA1;
-  } else {
+  } else if (!tls1_get_legacy_signature_algorithm(&signature_algorithm,
+                                                  hs->peer_pubkey)) {
     al = SSL_AD_UNSUPPORTED_CERTIFICATE;
     OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE);
     goto f_err;