diff --git a/include/polarssl/config.h b/include/polarssl/config.h
index 84f4fe1..5742fe5 100644
--- a/include/polarssl/config.h
+++ b/include/polarssl/config.h
@@ -94,6 +94,15 @@
  *
 #define POLARSSL_HAVE_SSE2
  */
+
+/**
+ * \def POLARSSL_HAVE_TIME
+ *
+ * System has time.h and time() / localtime()  / gettimeofday()
+ *
+ * Comment if your system does not support time functions
+ */
+#define POLARSSL_HAVE_TIME
 /* \} name */
 
 /**
diff --git a/include/polarssl/ssl.h b/include/polarssl/ssl.h
index 4bc0fad..eca6879 100644
--- a/include/polarssl/ssl.h
+++ b/include/polarssl/ssl.h
@@ -27,8 +27,6 @@
 #ifndef POLARSSL_SSL_H
 #define POLARSSL_SSL_H
 
-#include <time.h>
-
 #include "config.h"
 #include "net.h"
 #include "bignum.h"
@@ -60,6 +58,10 @@
 #include "zlib.h"
 #endif
 
+#if defined(POLARSSL_HAVE_TIME)
+#include <time.h>
+#endif
+
 #if defined(_MSC_VER) && !defined(inline)
 #define inline _inline
 #else
@@ -306,7 +308,9 @@
  */
 struct _ssl_session
 {
+#if defined(POLARSSL_HAVE_TIME)
     time_t start;               /*!< starting time      */
+#endif
     int ciphersuite;            /*!< chosen ciphersuite */
     int compression;            /*!< chosen compression */
     size_t length;              /*!< session id length  */
diff --git a/include/polarssl/ssl_cache.h b/include/polarssl/ssl_cache.h
index c47330d..979dc14 100644
--- a/include/polarssl/ssl_cache.h
+++ b/include/polarssl/ssl_cache.h
@@ -46,7 +46,9 @@
  */
 struct _ssl_cache_entry
 {
+#if defined(POLARSSL_HAVE_TIME)
     time_t timestamp;           /*!< entry timestamp    */
+#endif
     ssl_session session;        /*!< entry session      */
 #if defined(POLARSSL_X509_PARSE_C)
     x509_buf peer_cert;         /*!< entry peer_cert    */
@@ -87,6 +89,7 @@
  */
 int ssl_cache_set( void *data, const ssl_session *session );
 
+#if defined(POLARSSL_HAVE_TIME)
 /**
  * \brief          Set the cache timeout
  *                 (Default: SSL_CACHE_DEFAULT_TIMEOUT (1 day))
@@ -97,6 +100,7 @@
  * \param timeout  cache entry timeout
  */
 void ssl_cache_set_timeout( ssl_cache_context *cache, int timeout );
+#endif /* POLARSSL_HAVE_TIME */
 
 /**
  * \brief          Set the cache timeout