diff --git a/Dockerfile b/Dockerfile
index 6535d7f..41d0246 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,4 +12,4 @@ RUN crystal build --static --release ./src/app.cr
 FROM alpine:latest
 WORKDIR /
 COPY --from=builder /opt/app .
-ENTRYPOINT ["./app"]
\ No newline at end of file
+ENTRYPOINT ["./app -p $PORT"]
\ No newline at end of file