diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 86d984f..066147a 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -157,13 +157,13 @@
 int mbedtls_ssl_tls13_write_sig_alg_ext( mbedtls_ssl_context *ssl,
                                          unsigned char *buf,
                                          unsigned char *end,
-                                         size_t *olen )
+                                         size_t *out_len )
 {
     unsigned char *p = buf;
     unsigned char *supported_sig_alg; /* Start of supported_signature_algorithms */
     size_t supported_sig_alg_len = 0; /* Length of supported_signature_algorithms */
 
-    *olen = 0;
+    *out_len = 0;
 
     /* Skip the extension on the client if all allowed key exchanges
      * are PSK-based. */
@@ -214,7 +214,7 @@
     MBEDTLS_PUT_UINT16_BE( supported_sig_alg_len, buf, 4 );
 
     /* Output the total length of signature algorithms extension. */
-    *olen = p - buf;
+    *out_len = p - buf;
 
     ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SIG_ALG;
     return( 0 );
@@ -321,9 +321,9 @@
     unsigned char verify_hash[MBEDTLS_MD_MAX_SIZE];
     size_t verify_hash_len;
 
-    void const *opts_ptr = NULL;
+    void const *options = NULL;
 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
-    mbedtls_pk_rsassa_pss_options opts;
+    mbedtls_pk_rsassa_pss_options rsassa_pss_options;
 #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
 
     /*
@@ -443,17 +443,17 @@
     if( sig_alg == MBEDTLS_PK_RSASSA_PSS )
     {
         const mbedtls_md_info_t* md_info;
-        opts.mgf1_hash_id = md_alg;
+        rsassa_pss_options.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;
+        rsassa_pss_options.expected_salt_len = mbedtls_md_get_size( md_info );
+        options = (const void*) &rsassa_pss_options;
     }
 #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
 
-    if( ( ret = mbedtls_pk_verify_ext( sig_alg, opts_ptr,
+    if( ( ret = mbedtls_pk_verify_ext( sig_alg, options,
                                        &ssl->session_negotiate->peer_cert->pk,
                                        md_alg, verify_hash, verify_hash_len,
                                        p, signature_len ) ) == 0 )
@@ -1081,7 +1081,7 @@
 static int ssl_tls13_write_finished_message_body( mbedtls_ssl_context *ssl,
                                                   unsigned char *buf,
                                                   unsigned char *end,
-                                                  size_t *olen )
+                                                  size_t *out_len )
 {
     size_t verify_data_len = ssl->handshake->state_local.finished_out.digest_len;
     /*
@@ -1094,7 +1094,7 @@
     memcpy( buf, ssl->handshake->state_local.finished_out.digest,
             verify_data_len );
 
-    *olen = verify_data_len;
+    *out_len = verify_data_len;
     return( 0 );
 }