diff --git a/Dockerfile b/Dockerfile
index 7067a7b..0784495 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,6 +22,8 @@ RUN curl -L https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/p
     pyenv global ${PYTHON_VERSION} && \
     pip install tornado pyzmq transitions
 
+ENV TFW_WEB_PORT=4242
+EXPOSE ${TFW_WEB_PORT}
 ENV TFW_APP_DIR="/srv/app"
 COPY src/app ${TFW_APP_DIR}
 
@@ -39,7 +41,5 @@ ENV TFW_SUPERVISORD_CONF="/etc/supervisor/supervisord.conf"
 ENV TFW_SUPERVISOR_HTTP_PORT=9001
 COPY supervisord.conf ${TFW_SUPERVISORD_CONF}
 
-ENV WEB_PORT=4242
-EXPOSE ${WEB_PORT}
 
 CMD . "$HOME/.pyenvrc" && exec supervisord --nodaemon
diff --git a/lib/config/envvars.py b/lib/config/envvars.py
index 19c27b8..7e11869 100644
--- a/lib/config/envvars.py
+++ b/lib/config/envvars.py
@@ -2,7 +2,7 @@ import os
 
 PUBLISHER_PORT = os.getenv('PUBLISHER_PORT', 7654)
 RECEIVER_PORT = os.getenv('RECEIVER_PORT', 8765)
-WEB_PORT = os.getenv('WEB_PORT', 4242)
+WEB_PORT = os.getenv('TFW_WEB_PORT', 4242)
 SUPERVISOR_HTTP_PORT = os.getenv('TFW_SUPERVISOR_PORT', 9001)
 LOGIN_APP_PORT= os.getenv('TFW_LOGIN_APP_PORT', 6666)