diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index f0ce377..50d6a68 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -674,6 +674,9 @@
     ext_len += olen;
 #endif
 
+    /* olen unused if all extensions are disabled */
+    ((void) olen);
+
     SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d",
                    ext_len ) );
 
@@ -892,7 +895,9 @@
     size_t n;
     size_t ext_len;
     unsigned char *buf, *ext;
+#if defined(POLARSSL_SSL_RENEGOTIATION)
     int renegotiation_info_seen = 0;
+#endif
     int handshake_failure = 0;
 #if defined(POLARSSL_DEBUG_C)
     uint32_t t;
@@ -1126,7 +1131,9 @@
         {
         case TLS_EXT_RENEGOTIATION_INFO:
             SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
+#if defined(POLARSSL_SSL_RENEGOTIATION)
             renegotiation_info_seen = 1;
+#endif
 
             if( ( ret = ssl_parse_renegotiation_info( ssl, ext + 4,
                                                       ext_size ) ) != 0 )
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index 2017abe..1dcf31c 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -1128,7 +1128,9 @@
     unsigned int comp_len;
     unsigned int ext_len = 0;
     unsigned char *buf, *p, *ext;
+#if defined(POLARSSL_SSL_RENEGOTIATION)
     int renegotiation_info_seen = 0;
+#endif
     int handshake_failure = 0;
     const int *ciphersuites;
     const ssl_ciphersuite_t *ciphersuite_info;
@@ -1376,9 +1378,9 @@
 
                 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
             }
+            renegotiation_info_seen = 1;
 #endif /* POLARSSL_SSL_RENEGOTIATION */
             ssl->secure_renegotiation = SSL_SECURE_RENEGOTIATION;
-            renegotiation_info_seen = 1;
             break;
         }
     }
@@ -1413,7 +1415,9 @@
 
         case TLS_EXT_RENEGOTIATION_INFO:
             SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
+#if defined(POLARSSL_SSL_RENEGOTIATION)
             renegotiation_info_seen = 1;
+#endif
 
             ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size );
             if( ret != 0 )