diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 1a5cb01..04c199e 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -2733,6 +2733,9 @@
     uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
     uint64_t bit;
 
+    if( ssl->anti_replay == SSL_ANTI_REPLAY_DISABLED )
+        return( 0 );
+
     if( rec_seqnum > ssl->in_window_top )
         return( 0 );
 
@@ -2754,6 +2757,9 @@
 {
     uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
 
+    if( ssl->anti_replay == SSL_ANTI_REPLAY_DISABLED )
+        return;
+
     if( rec_seqnum > ssl->in_window_top )
     {
         /* Update window_top and the contents of the window */
@@ -4528,6 +4534,10 @@
     ssl->f_cookie_check = ssl_cookie_check_dummy;
 #endif
 
+#if defined(POLARSSL_SSL_DTLS_ANTI_REPLAY)
+    ssl->anti_replay = SSL_ANTI_REPLAY_ENABLED;
+#endif
+
     if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
         return( ret );
 
@@ -4745,6 +4755,13 @@
     return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
 }
 
+#if defined(POLARSSL_SSL_DTLS_ANTI_REPLAY)
+void ssl_set_dtls_anti_replay( ssl_context *ssl, char mode )
+{
+    ssl->anti_replay = mode;
+}
+#endif
+
 void ssl_set_authmode( ssl_context *ssl, int authmode )
 {
     ssl->authmode   = authmode;