diff --git a/Dockerfile b/Dockerfile
index a149ae0..657c11b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -77,5 +77,6 @@ COPY icinga2-bin/ /
 RUN ["install", "-o", "icinga", "-g", "icinga", "-d", "/data"]
 RUN ["bash", "-exo", "pipefail", "-c", "for d in /etc/icinga2 /var/*/icinga2; do mkdir -p $(dirname /data-init$d); mv $d /data-init$d; ln -vs /data$d $d; done"]
 
+EXPOSE 5665
 USER icinga
 CMD ["icinga2", "daemon"]