diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 078daea352..7cb8bbd8c1 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -302,11 +302,12 @@ static int ssl_tls13_parse_certificate_verify(mbedtls_ssl_context *ssl,
 
     MBEDTLS_SSL_DEBUG_BUF(3, "verify hash", verify_hash, verify_hash_len);
 
-    if ((ret = mbedtls_pk_verify_ext((mbedtls_pk_sigalg_t) sig_alg,
-                                     &ssl->session_negotiate->peer_cert->pk,
-                                     md_alg, verify_hash, verify_hash_len,
-                                     p, signature_len)) == 0) {
-        return 0;
+    ret = mbedtls_pk_verify_ext((mbedtls_pk_sigalg_t) sig_alg,
+                                &ssl->session_negotiate->peer_cert->pk,
+                                md_alg, verify_hash, verify_hash_len,
+                                p, signature_len);
+    if (ret == 0) {
+        return ret;
     }
     MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_pk_verify_ext", ret);