diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 12ef4d5..6b7a6f8 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -320,6 +320,11 @@
     unsigned char verify_hash[MBEDTLS_MD_MAX_SIZE];
     size_t verify_hash_len;
 
+    void const *opts_ptr = NULL;
+#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
+    mbedtls_pk_rsassa_pss_options opts;
+#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
+
     /*
      * struct {
      *     SignatureScheme algorithm;
@@ -368,6 +373,13 @@
             md_alg = MBEDTLS_MD_SHA512;
             sig_alg = MBEDTLS_PK_ECDSA;
             break;
+#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
+        case MBEDTLS_TLS13_SIG_RSA_PSS_RSAE_SHA256:
+            MBEDTLS_SSL_DEBUG_MSG( 4, ( "Certificate Verify: using RSA" ) );
+            md_alg = MBEDTLS_MD_SHA256;
+            sig_alg = MBEDTLS_PK_RSASSA_PSS;
+            break;
+#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
         default:
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "Certificate Verify: Unknown signature algorithm." ) );
             goto error;
@@ -426,8 +438,21 @@
     }
 
     MBEDTLS_SSL_DEBUG_BUF( 3, "verify hash", verify_hash, verify_hash_len );
+#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
+    if( sig_alg == MBEDTLS_PK_RSASSA_PSS )
+    {
+        const mbedtls_md_info_t* md_info;
+        opts.mgf1_hash_id = md_alg;
+        if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL )
+        {
+            return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+        }
+        opts.expected_salt_len = mbedtls_md_get_size( md_info );
+        opts_ptr = (const void*) &opts;
+    }
+#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
 
-    if( ( ret = mbedtls_pk_verify_ext( sig_alg, NULL,
+    if( ( ret = mbedtls_pk_verify_ext( sig_alg, opts_ptr,
                                        &ssl->session_negotiate->peer_cert->pk,
                                        md_alg, verify_hash, verify_hash_len,
                                        p, signature_len ) ) == 0 )