diff --git a/include/polarssl/ssl_cache.h b/include/polarssl/ssl_cache.h
index 10cff20..0b3d5cc 100644
--- a/include/polarssl/ssl_cache.h
+++ b/include/polarssl/ssl_cache.h
@@ -46,7 +46,9 @@
 {
     time_t timestamp;           /*!< entry timestamp    */
     ssl_session session;        /*!< entry session      */
+#if defined(POLARSSL_X509_PARSE_C)
     x509_buf peer_cert;         /*!< entry peer_cert    */
+#endif
     ssl_cache_entry *next;      /*!< chain pointer      */
 };