diff --git a/include/polarssl/config.h b/include/polarssl/config.h
index 22faf04..bb88ea9 100644
--- a/include/polarssl/config.h
+++ b/include/polarssl/config.h
@@ -529,6 +529,15 @@
 #define POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO
 
 /**
+ * \def POLARSSL_SSL_MAX_FRAGMENT_LENGTH
+ *
+ * Enable support for RFC 6066 max_fragment_length extension in SSL
+ *
+ * Comment this macro to disable support for the max_fragment_length extension
+ */
+#define POLARSSL_SSL_MAX_FRAGMENT_LENGTH
+
+/**
  * \def POLARSSL_SSL_SESSION_TICKETS
  *
  * Enable support for RFC 5077 session tickets in SSL
diff --git a/include/polarssl/ssl.h b/include/polarssl/ssl.h
index ed11e1e..d0e71e3 100644
--- a/include/polarssl/ssl.h
+++ b/include/polarssl/ssl.h
@@ -362,7 +362,10 @@
     uint32_t ticket_lifetime;   /*!< ticket lifetime hint    */
 #endif /* POLARSSL_SSL_SESSION_TICKETS */
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
     unsigned char mfl_code;     /*!< MaxFragmentLength negotiated by peer */
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
+
     int trunc_hmac;             /*!< flag for truncated hmac activation   */
 };
 
@@ -560,7 +563,9 @@
     size_t out_msglen;          /*!< record header: message length    */
     size_t out_left;            /*!< amount of data not yet written   */
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
     unsigned char mfl_code;     /*!< MaxFragmentLength chosen by us   */
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
     /*
      * PKI layer
@@ -1025,6 +1030,7 @@
  */
 void ssl_set_min_version( ssl_context *ssl, int major, int minor );
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
 /**
  * \brief          Set the maximum fragment length to emit and/or negotiate
  *                 (Default: SSL_MAX_CONTENT_LEN, usually 2^14 bytes)
@@ -1041,6 +1047,7 @@
  * \return         O if successful or POLARSSL_ERR_SSL_BAD_INPUT_DATA
  */
 int ssl_set_max_frag_len( ssl_context *ssl, unsigned char mfl_code );
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
 /**
  * \brief          Activate negotiation of truncated HMAC (Client only)
diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index ac72832..772b2c9 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -276,6 +276,7 @@
 }
 #endif
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
 static void ssl_write_max_fragment_length_ext( ssl_context *ssl,
                                                unsigned char *buf,
                                                size_t *olen )
@@ -299,6 +300,7 @@
 
     *olen = 5;
 }
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
 static void ssl_write_truncated_hmac_ext( ssl_context *ssl,
                                           unsigned char *buf, size_t *olen )
@@ -546,8 +548,10 @@
     ext_len += olen;
 #endif
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
     ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
     ext_len += olen;
+#endif
 
     ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
     ext_len += olen;
@@ -621,6 +625,7 @@
     return( 0 );
 }
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
 static int ssl_parse_max_fragment_length_ext( ssl_context *ssl,
                                               const unsigned char *buf,
                                               size_t len )
@@ -638,6 +643,7 @@
 
     return( 0 );
 }
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
 static int ssl_parse_truncated_hmac_ext( ssl_context *ssl,
                                          const unsigned char *buf,
@@ -891,6 +897,7 @@
 
             break;
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
         case TLS_EXT_MAX_FRAGMENT_LENGTH:
             SSL_DEBUG_MSG( 3, ( "found max_fragment_length extension" ) );
 
@@ -901,6 +908,7 @@
             }
 
             break;
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
         case TLS_EXT_TRUNCATED_HMAC:
             SSL_DEBUG_MSG( 3, ( "found truncated_hmac extension" ) );
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index 7de1577..ff0e9d1 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -564,6 +564,7 @@
 }
 #endif /* POLARSSL_ECP_C */
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
 static int ssl_parse_max_fragment_length_ext( ssl_context *ssl,
                                               const unsigned char *buf,
                                               size_t len )
@@ -578,6 +579,7 @@
 
     return( 0 );
 }
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
 static int ssl_parse_truncated_hmac_ext( ssl_context *ssl,
                                          const unsigned char *buf,
@@ -1174,6 +1176,7 @@
             break;
 #endif /* POLARSSL_ECP_C */
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
         case TLS_EXT_MAX_FRAGMENT_LENGTH:
             SSL_DEBUG_MSG( 3, ( "found max fragment length extension" ) );
 
@@ -1181,6 +1184,7 @@
             if( ret != 0 )
                 return( ret );
             break;
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
         case TLS_EXT_TRUNCATED_HMAC:
             SSL_DEBUG_MSG( 3, ( "found truncated hmac extension" ) );
@@ -1386,6 +1390,7 @@
     *olen = 5 + ssl->verify_data_len * 2;
 }
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
 static void ssl_write_max_fragment_length_ext( ssl_context *ssl,
                                                unsigned char *buf,
                                                size_t *olen )
@@ -1410,6 +1415,7 @@
 
     *olen = 5;
 }
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
 static int ssl_write_server_hello( ssl_context *ssl )
 {
@@ -1551,8 +1557,10 @@
     ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
     ext_len += olen;
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
     ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
     ext_len += olen;
+#endif
 
     ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
     ext_len += olen;
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index bb605b9..1281bc8 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -59,6 +59,7 @@
 #define strcasecmp _stricmp
 #endif
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
 /*
  * Convert max_fragment_length codes to length.
  * RFC 6066 says:
@@ -75,6 +76,7 @@
     2048,                   /* SSL_MAX_FRAG_LEN_2048 */
     4096,                   /* SSL_MAX_FRAG_LEN_4096 */
 };
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
 static int ssl_session_copy( ssl_session *dst, const ssl_session *src )
 {
@@ -3238,6 +3240,7 @@
     ssl->min_minor_ver = minor;
 }
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
 int ssl_set_max_frag_len( ssl_context *ssl, unsigned char mfl_code )
 {
     if( mfl_code >= sizeof( mfl_code_to_length ) ||
@@ -3250,6 +3253,7 @@
 
     return( 0 );
 }
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
 int ssl_set_truncated_hmac( ssl_context *ssl, int truncate )
 {
@@ -3555,7 +3559,7 @@
 {
     int ret;
     size_t n;
-    unsigned int max_len;
+    unsigned int max_len = SSL_MAX_CONTENT_LEN;
 
     SSL_DEBUG_MSG( 2, ( "=> write" ) );
 
@@ -3568,19 +3572,21 @@
         }
     }
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
     /*
      * Assume mfl_code is correct since it was checked when set
      */
     max_len = mfl_code_to_length[ssl->mfl_code];
 
     /*
-     * Check if a smaller max length was negociated
+     * Check if a smaller max length was negotiated
      */
     if( ssl->session_out != NULL &&
         mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
     {
         max_len = mfl_code_to_length[ssl->session_out->mfl_code];
     }
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
 
     n = ( len < max_len) ? len : max_len;
 
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 291795f..a422bf4 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -185,6 +185,14 @@
 #define USAGE_TICKETS ""
 #endif /* POLARSSL_SSL_SESSION_TICKETS */
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
+#define USAGE_MAX_FRAG_LEN                                      \
+    "    max_frag_len=%%d     default: 16384 (tls default)\n"   \
+    "                        options: 512, 1024, 2048, 4096\n"
+#else
+#define USAGE_MAX_FRAG_LEN ""
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
+
 #define USAGE \
     "\n usage: ssl_client2 param=<>...\n"                   \
     "\n acceptable parameters:\n"                           \
@@ -204,8 +212,7 @@
     "                        options: ssl3, tls1, tls1_1, tls1_2\n" \
     "    auth_mode=%%s        default: \"optional\"\n"          \
     "                        options: none, optional, required\n" \
-    "    max_frag_len=%%d     default: 16384 (tls default)\n"   \
-    "                        options: 512, 1024, 2048, 4096\n"  \
+    USAGE_MAX_FRAG_LEN                                      \
     "    trunc_hmac=%%d       default: 0 (disabled)\n"      \
     USAGE_PSK                                               \
     "\n"                                                    \
@@ -671,7 +678,9 @@
     ssl_set_endpoint( &ssl, SSL_IS_CLIENT );
     ssl_set_authmode( &ssl, opt.auth_mode );
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
     ssl_set_max_frag_len( &ssl, opt.mfl_code );
+#endif
 
     if( opt.trunc_hmac != 0 )
         ssl_set_truncated_hmac( &ssl, SSL_TRUNC_HMAC_ENABLED );
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index aca0db5..681850b 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -153,6 +153,14 @@
 #define USAGE_TICKETS ""
 #endif /* POLARSSL_SSL_SESSION_TICKETS */
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
+#define USAGE_MAX_FRAG_LEN                                      \
+    "    max_frag_len=%%d     default: 16384 (tls default)\n"   \
+    "                        options: 512, 1024, 2048, 4096\n"
+#else
+#define USAGE_MAX_FRAG_LEN ""
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
+
 #define USAGE \
     "\n usage: ssl_server2 param=<>...\n"                   \
     "\n acceptable parameters:\n"                           \
@@ -169,8 +177,7 @@
     "                        options: ssl3, tls1, tls1_1, tls1_2\n" \
     "    auth_mode=%%s        default: \"optional\"\n"      \
     "                        options: none, optional, required\n" \
-    "    max_frag_len=%%d     default: 16384 (tls default)\n"  \
-    "                        options: 512, 1024, 2048, 4096\n" \
+    USAGE_MAX_FRAG_LEN                                      \
     USAGE_PSK                                               \
     "\n"                                                    \
     "    force_ciphersuite=<name>    default: all enabled\n"\
@@ -618,7 +625,9 @@
     ssl_set_endpoint( &ssl, SSL_IS_SERVER );
     ssl_set_authmode( &ssl, opt.auth_mode );
 
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
     ssl_set_max_frag_len( &ssl, opt.mfl_code );
+#endif
 
     ssl_set_rng( &ssl, ctr_drbg_random, &ctr_drbg );
     ssl_set_dbg( &ssl, my_debug, stdout );