diff --git a/Dockerfile b/Dockerfile
index 0f2e338..c811a63 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -39,4 +39,6 @@ COPY . .
 # Compile assets
 RUN bundle exec rails webpacker:clobber webpacker:compile
 
+ENV PORT=80
+EXPOSE 80
 ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]