diff --git a/configs/config-ccm-psk-tls1_2.h b/configs/config-ccm-psk-tls1_2.h
index bd2c1a3..c9b58dd 100644
--- a/configs/config-ccm-psk-tls1_2.h
+++ b/configs/config-ccm-psk-tls1_2.h
@@ -41,7 +41,6 @@
 /* mbed TLS feature support */
 #define MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
 #define MBEDTLS_SSL_PROTO_TLS1_2
-#define MBEDTLS_SSL_PROTO_TLS
 
 /* mbed TLS modules */
 #define MBEDTLS_AES_C
diff --git a/configs/config-mini-tls1_1.h b/configs/config-mini-tls1_1.h
index 349ea8e..013bc03 100644
--- a/configs/config-mini-tls1_1.h
+++ b/configs/config-mini-tls1_1.h
@@ -40,7 +40,6 @@
 #define MBEDTLS_PKCS1_V15
 #define MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
 #define MBEDTLS_SSL_PROTO_TLS1_1
-#define MBEDTLS_SSL_PROTO_TLS
 
 /* mbed TLS modules */
 #define MBEDTLS_AES_C
diff --git a/configs/config-suite-b.h b/configs/config-suite-b.h
index e6fad1c..18e2c40 100644
--- a/configs/config-suite-b.h
+++ b/configs/config-suite-b.h
@@ -47,7 +47,6 @@
 #define MBEDTLS_ECP_DP_SECP384R1_ENABLED
 #define MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
 #define MBEDTLS_SSL_PROTO_TLS1_2
-#define MBEDTLS_SSL_PROTO_TLS
 
 /* mbed TLS modules */
 #define MBEDTLS_AES_C
diff --git a/configs/config-thread.h b/configs/config-thread.h
index 3166aa9..4fa0b8d 100644
--- a/configs/config-thread.h
+++ b/configs/config-thread.h
@@ -49,6 +49,7 @@
 #define MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
 #define MBEDTLS_SSL_PROTO_TLS1_2
 #define MBEDTLS_SSL_PROTO_DTLS
+#define MBEDTLS_SSL_PROTO_NO_TLS
 #define MBEDTLS_SSL_DTLS_ANTI_REPLAY
 #define MBEDTLS_SSL_DTLS_HELLO_VERIFY
 #define MBEDTLS_SSL_EXPORT_KEYS
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index b3677b5..34f1a3b 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -566,7 +566,7 @@
 #endif
 
 #if defined(MBEDTLS_SSL_TLS_C) && \
-    ( !defined(MBEDTLS_SSL_PROTO_TLS) && !defined(MBEDTLS_SSL_PROTO_DTLS) )
+    ( defined(MBEDTLS_SSL_PROTO_NO_TLS) && !defined(MBEDTLS_SSL_PROTO_DTLS) )
 #error "MBEDTLS_SSL_TLS_C defined, but neither TLS or DTLS is active"
 #endif
 
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index e0b5ba4..1653f89 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1508,7 +1508,7 @@
  * Enable this and MBEDTLS_SSL_PROTO_TLS1_2 to enable DTLS 1.2,
  * and/or this and MBEDTLS_SSL_PROTO_TLS1_1 to enable DTLS 1.0.
  *
- * \see MBEDTLS_SSL_PROTO_TLS
+ * \see MBEDTLS_SSL_PROTO_NO_TLS
  *
  * Requires: MBEDTLS_SSL_PROTO_TLS1_1
  *        or MBEDTLS_SSL_PROTO_TLS1_2
@@ -1518,25 +1518,22 @@
 #define MBEDTLS_SSL_PROTO_DTLS
 
 /**
- * \def MBEDTLS_SSL_PROTO_TLS
+ * \def MBEDTLS_SSL_PROTO_NO_TLS
  *
- * Enable support for SSL/TLS (all available versions).
+ * Disable support for SSL/TLS (all available versions) - this doesn't affect
+ * support for DTLS which is controlled by #MBEDTLS_SSL_PROTO_DTLS.
  *
- * Enable this and MBEDTLS_SSL_PROTO_TLS1_2 to enable TLS 1.2;
- * enable this and MBEDTLS_SSL_PROTO_TLS1_1 to enable TLS 1.1;
- * enable this and MBEDTLS_SSL_PROTO_TLS1   to enable TLS 1.0;
- * and/or this and MBEDTLS_SSL_PROTO_SSL3   to enable SSL 3.0 (deprecated).
+ * Disable this and enable MBEDTLS_SSL_PROTO_TLS1_2 to enable TLS 1.2;
+ * disable this and enable MBEDTLS_SSL_PROTO_TLS1_1 to enable TLS 1.1;
+ * disable this and enable MBEDTLS_SSL_PROTO_TLS1   to enable TLS 1.0;
+ * disable this and enable MBEDTLS_SSL_PROTO_SSL3   to enable SSL 3.0.
  *
- * \see MBEDTLS_SSL_PROTO_DTLS
+ * Requirements: if this macro is disabled, at least one of the above
+ * TLS versions needs to be enabled.
  *
- * Requires: MBEDTLS_SSL_PROTO_TLS1_2
- *        or MBEDTLS_SSL_PROTO_TLS1_1
- *        or MBEDTLS_SSL_PROTO_TLS1
- *        or MBEDTLS_SSL_PROTO_SSL3 (deprecated)
- *
- * Comment this macro to disable support for TLS
+ * Uncomment this macro to disable support for TLS.
  */
-#define MBEDTLS_SSL_PROTO_TLS
+//#define MBEDTLS_SSL_PROTO_NO_TLS
 
 /**
  * \def MBEDTLS_SSL_ALPN
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 653f857..1a4eaf6 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1337,8 +1337,8 @@
 
 /**
  * \brief           Set the transport type (TLS or DTLS).
- *                  Default: TLS if #MBEDTLS_SSL_PROTO_TLS is defined, else
- *                  DTLS.
+ *                  Default: TLS unless #MBEDTLS_SSL_PROTO_NO_TLS is defined,
+ *                  else DTLS.
  *
  * \note            For DTLS, you must either provide a recv callback that
  *                  doesn't block, or one that handles timeouts, see
diff --git a/include/mbedtls/ssl_internal.h b/include/mbedtls/ssl_internal.h
index 1c8709f..e6c829d 100644
--- a/include/mbedtls/ssl_internal.h
+++ b/include/mbedtls/ssl_internal.h
@@ -58,6 +58,12 @@
 #define inline __inline
 #endif
 
+/* The public option is negative for backwards compatibility,
+ * but internally a poisitive option is more convenient. */
+#if !defined(MBEDTLS_SSL_PROTO_NO_TLS)
+#define MBEDTLS_SSL_PROTO_TLS
+#endif
+
 /* Determine minimum supported version */
 #define MBEDTLS_SSL_MIN_MAJOR_VERSION           MBEDTLS_SSL_MAJOR_VERSION_3
 
diff --git a/library/version_features.c b/library/version_features.c
index fc0b1f8..b1458a4 100644
--- a/library/version_features.c
+++ b/library/version_features.c
@@ -486,9 +486,9 @@
 #if defined(MBEDTLS_SSL_PROTO_DTLS)
     "MBEDTLS_SSL_PROTO_DTLS",
 #endif /* MBEDTLS_SSL_PROTO_DTLS */
-#if defined(MBEDTLS_SSL_PROTO_TLS)
-    "MBEDTLS_SSL_PROTO_TLS",
-#endif /* MBEDTLS_SSL_PROTO_TLS */
+#if defined(MBEDTLS_SSL_PROTO_NO_TLS)
+    "MBEDTLS_SSL_PROTO_NO_TLS",
+#endif /* MBEDTLS_SSL_PROTO_NO_TLS */
 #if defined(MBEDTLS_SSL_ALPN)
     "MBEDTLS_SSL_ALPN",
 #endif /* MBEDTLS_SSL_ALPN */
diff --git a/programs/ssl/query_config.c b/programs/ssl/query_config.c
index be35a76..d04f512 100644
--- a/programs/ssl/query_config.c
+++ b/programs/ssl/query_config.c
@@ -1338,13 +1338,13 @@
     }
 #endif /* MBEDTLS_SSL_PROTO_DTLS */
 
-#if defined(MBEDTLS_SSL_PROTO_TLS)
-    if( strcmp( "MBEDTLS_SSL_PROTO_TLS", config ) == 0 )
+#if defined(MBEDTLS_SSL_PROTO_NO_TLS)
+    if( strcmp( "MBEDTLS_SSL_PROTO_NO_TLS", config ) == 0 )
     {
-        MACRO_EXPANSION_TO_STR( MBEDTLS_SSL_PROTO_TLS );
+        MACRO_EXPANSION_TO_STR( MBEDTLS_SSL_PROTO_NO_TLS );
         return( 0 );
     }
-#endif /* MBEDTLS_SSL_PROTO_TLS */
+#endif /* MBEDTLS_SSL_PROTO_NO_TLS */
 
 #if defined(MBEDTLS_SSL_ALPN)
     if( strcmp( "MBEDTLS_SSL_ALPN", config ) == 0 )
diff --git a/programs/ssl/ssl_client1.c b/programs/ssl/ssl_client1.c
index fc601ec..5d67583 100644
--- a/programs/ssl/ssl_client1.c
+++ b/programs/ssl/ssl_client1.c
@@ -44,14 +44,14 @@
     !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) ||         \
     !defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C) || \
     !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \
-    !defined(MBEDTLS_SSL_PROTO_TLS)
+    defined(MBEDTLS_SSL_PROTO_NO_TLS)
 int main( void )
 {
     mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
            "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
            "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
            "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or"
-           "MBEDTLS_SSL_PROTO_TLS not defined.\n");
+           "not defined, and/or MBEDTLS_SSL_PROTO_NO_TLS defined.\n");
     return( 0 );
 }
 #else
diff --git a/programs/ssl/ssl_fork_server.c b/programs/ssl/ssl_fork_server.c
index 62b4c40..bbe61fd 100644
--- a/programs/ssl/ssl_fork_server.c
+++ b/programs/ssl/ssl_fork_server.c
@@ -44,7 +44,7 @@
     !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) ||    \
     !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_TIMING_C) || \
     !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_PEM_PARSE_C) || \
-    !defined(MBEDTLS_SSL_PROTO_TLS)
+    defined(MBEDTLS_SSL_PROTO_NO_TLS)
 int main( int argc, char *argv[] )
 {
     ((void) argc);
@@ -54,8 +54,8 @@
            "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
            "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
            "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
-           "MBEDTLS_TIMING_C and/or MBEDTLS_PEM_PARSE_C and/or "
-           "MBEDTLS_SSL_PROTO_TLS not defined.\n");
+           "MBEDTLS_TIMING_C and/or MBEDTLS_PEM_PARSE_C not defined, and/or "
+           "MBEDTLS_SSL_PROTO_NO_TLS defined.\n");
     return( 0 );
 }
 #elif defined(_WIN32)
diff --git a/programs/ssl/ssl_mail_client.c b/programs/ssl/ssl_mail_client.c
index 55c90c6..bc3fc8b 100644
--- a/programs/ssl/ssl_mail_client.c
+++ b/programs/ssl/ssl_mail_client.c
@@ -48,14 +48,14 @@
     !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
     !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) ||         \
     !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \
-    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_SSL_PROTO_TLS)
+    !defined(MBEDTLS_FS_IO) || defined(MBEDTLS_SSL_PROTO_NO_TLS)
 int main( void )
 {
     mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
            "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
            "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
-           "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
-           "MBEDTLS_SSL_PROTO_TLS not defined.\n");
+           "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
+           "not defined, and/or MBEDTLS_SSL_PROTO_NO_TLS defined.\n");
     return( 0 );
 }
 #else
diff --git a/programs/ssl/ssl_pthread_server.c b/programs/ssl/ssl_pthread_server.c
index b00f476..17f4584 100644
--- a/programs/ssl/ssl_pthread_server.c
+++ b/programs/ssl/ssl_pthread_server.c
@@ -45,7 +45,7 @@
     !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) ||            \
     !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) ||      \
     !defined(MBEDTLS_THREADING_C) || !defined(MBEDTLS_THREADING_PTHREAD) || \
-    !defined(MBEDTLS_PEM_PARSE_C) || !defined(MBEDTLS_SSL_PROTO_TLS)
+    !defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_SSL_PROTO_NO_TLS)
 int main( void )
 {
     mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
@@ -53,8 +53,8 @@
            "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
            "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
            "MBEDTLS_THREADING_C and/or MBEDTLS_THREADING_PTHREAD "
-           "and/or MBEDTLS_PEM_PARSE_C and/or "
-           "MBEDTLS_SSL_PROTO_TLS not defined.\n");
+           "and/or MBEDTLS_PEM_PARSE_C not defined, and/or "
+           "MBEDTLS_SSL_PROTO_NO_TLS defined.\n");
     return( 0 );
 }
 #else
diff --git a/programs/ssl/ssl_server.c b/programs/ssl/ssl_server.c
index 05d58fa..9791856 100644
--- a/programs/ssl/ssl_server.c
+++ b/programs/ssl/ssl_server.c
@@ -44,15 +44,15 @@
     !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) ||     \
     !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) ||    \
     !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
-    !defined(MBEDTLS_PEM_PARSE_C) || !defined(MBEDTLS_SSL_PROTO_TLS)
+    !defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_SSL_PROTO_NO_TLS)
 int main( void )
 {
     mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
            "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
            "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
            "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
-           "and/or MBEDTLS_PEM_PARSE_C and/or "
-           "MBEDTLS_SSL_PROTO_TLS not defined.\n");
+           "and/or MBEDTLS_PEM_PARSE_C not defined, and/or "
+           "MBEDTLS_SSL_PROTO_NO_TLS defined.\n");
     return( 0 );
 }
 #else
diff --git a/scripts/config.pl b/scripts/config.pl
index 86af553..ed9aa02 100755
--- a/scripts/config.pl
+++ b/scripts/config.pl
@@ -31,6 +31,7 @@
 #   MBEDTLS_REMOVE_ARC4_CIPHERSUITES
 #   MBEDTLS_REMOVE_3DES_CIPHERSUITES
 #   MBEDTLS_SSL_HW_RECORD_ACCEL
+#   MBEDTLS_SSL_PROTO_NO_DTLS
 #   MBEDTLS_RSA_NO_CRT
 #   MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3
 #   MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
@@ -92,6 +93,7 @@
 MBEDTLS_REMOVE_ARC4_CIPHERSUITES
 MBEDTLS_REMOVE_3DES_CIPHERSUITES
 MBEDTLS_SSL_HW_RECORD_ACCEL
+MBEDTLS_SSL_PROTO_NO_TLS
 MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3
 MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
 MBEDTLS_ZLIB_SUPPORT