diff --git a/config/sys.config b/config/sys.config
index a6016b6..2ee9a24 100644
--- a/config/sys.config
+++ b/config/sys.config
@@ -4,10 +4,10 @@
                %% Enables or disable TCP connections without TLS (true/false)
                {dev_mode, false},
                %% TCP port, only available if dev_mode is set to true.
-               {tcp_port, "${TCP_PORT}"},
+               {tcp_port, 1700},
                %% TLS port, specified in RFC to 700, but can be set to anything else
                %% in case that is needed.
-                {tls_port, "${TLS_PORT}"},
+               {tls_port, "${TLS_PORT}"},
           %% When set to true, you can connect to EPP over HTTPS endpoints without
 	       %% verifying their TLS certificates.
 	       {insecure, false},