diff --git a/Dockerfile b/Dockerfile
index 6ae005b..9811b75 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,6 +18,6 @@ COPY rootfs /
 COPY --from=build /dnsproxy /app/
 
 HEALTHCHECK --interval=30s --start-period=5s --timeout=10s \
-  CMD /usr/bin/host -T -p 1053 asperti.com 127.0.0.1
+  CMD /usr/bin/host -T -p ${PORT} asperti.com 127.0.0.1
 
 ENTRYPOINT ["/sbin/tini", "--", "/bin/sh", "/app/entrypoint.sh"]