diff --git a/Dockerfile b/Dockerfile
index ed95b6c..bc19a48 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,4 +13,6 @@ RUN python setup.py install
 ADD docker/run.sh /opt/run.sh
 RUN chmod 777 /opt/run.sh
 
+EXPOSE 57575
+
 CMD ["/opt/run.sh"]
\ No newline at end of file
diff --git a/docker/run.sh b/docker/run.sh
index 3489294..4b4e7ec 100644
--- a/docker/run.sh
+++ b/docker/run.sh
@@ -3,4 +3,11 @@
 # Set password
 echo "root:${PASSWORD}" | chpasswd
 
-/opt/app/butterfly.server.py --unsecure --host=0.0.0.0
\ No newline at end of file
+if [ -z ${PORT} ]
+then
+  echo "Starting on default port: 57575"
+  /opt/app/butterfly.server.py --unsecure --host=0.0.0.0
+else
+  echo "Starting on port: ${PORT}"
+  /opt/app/butterfly.server.py --unsecure --host=0.0.0.0 --port=${PORT}
+fi
\ No newline at end of file