diff --git a/files/Dockerfile b/files/Dockerfile
index c13d2b9..901143a 100644
--- a/files/Dockerfile
+++ b/files/Dockerfile
@@ -14,7 +14,7 @@ RUN echo "_dev_null: /dev/null" > /etc/aliases \
 	&& cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf \
 	&& mkdir -p /ssl && chmod 700 /ssl \
   && cp /etc/ssl/certs/ssl-cert-snakeoil.pem /ssl/cert.pem \
-  && cp /etc/ssl/private/ssl-cert-snakeoil.key /ssl/key.pem \
+  && cp /etc/ssl/private/ssl-cert-snakeoil.key /ssl/key.pem
 
 VOLUME /etc/postfix /ssl
 CMD postfix start-fg