diff --git a/Dockerfile b/Dockerfile
index 15db088..122451a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,8 +19,6 @@ RUN wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-k
 ADD start /start
 RUN chmod 755 /start
 
-EXPOSE 5432
-
+EXPOSE 5432/tcp
 VOLUME ["/var/lib/postgresql", "/run/postgresql"]
-
 CMD ["/start"]