diff --git a/src/openvpn/options.c b/src/openvpn/options.c
index dbe1425..64e67aa 100644
--- a/src/openvpn/options.c
+++ b/src/openvpn/options.c
@@ -8942,6 +8942,15 @@
             msg(msglevel, "unknown tls-version-min parameter: %s", p[1]);
             goto err;
         }
+
+#ifdef ENABLE_CRYPTO_MBEDTLS
+        if (ver < TLS_VER_1_2)
+        {
+            msg(M_WARN, "--tls-version-min %s is not supported by mbedtls, using 1.2", p[1]);
+            ver = TLS_VER_1_2;
+        }
+#endif
+
         options->ssl_flags &=
             ~(SSLF_TLS_VERSION_MIN_MASK << SSLF_TLS_VERSION_MIN_SHIFT);
         options->ssl_flags |= (ver << SSLF_TLS_VERSION_MIN_SHIFT);