diff --git a/swagger-ui/Dockerfile b/swagger-ui/Dockerfile
index 45fa63b..cdf9854 100644
--- a/swagger-ui/Dockerfile
+++ b/swagger-ui/Dockerfile
@@ -6,6 +6,7 @@ ENV FOLDER "swagger-ui-2.2.0"
 ENV API_URL "http://petstore.swagger.io/v2/swagger.json"
 ENV API_KEY "**None**"
 ENV SWAGGER_JSON "/app/swagger.json"
+ENV PORT 80
 
 WORKDIR /app
 
diff --git a/swagger-ui/README.md b/swagger-ui/README.md
index fb1ed39..bcba426 100644
--- a/swagger-ui/README.md
+++ b/swagger-ui/README.md
@@ -12,3 +12,4 @@ $ docker run -d -p 80:80 -e API_URL=http://localhost:4000/swagger schickling/swa
 
 * `API_URL` - Swagger endpoint for your API
 * `API_KEY` - Default API Key (optional)
+* `PORT`    - Default port to run on (optional)
diff --git a/swagger-ui/run.sh b/swagger-ui/run.sh
index ba5484d..22bca36 100644
--- a/swagger-ui/run.sh
+++ b/swagger-ui/run.sh
@@ -16,4 +16,4 @@ else
   sed -i "s|http://example.com/api|$API_URL|g" index.html
 fi
 
-exec http-server -p 80
+exec http-server -p $PORT $*