diff --git a/Dockerfile b/Dockerfile
index 70aa8ee..0e5fc74 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,8 +8,7 @@ RUN echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
     apt-get --force-yes -yq install wget apt-transport-https && \
     apt-key adv --keyserver keyserver.ubuntu.com --recv-keys D9D0BF019CC8AC0D && \
     apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1655A0AB68576280 && \
-    wget https://www.postgresql.org/media/keys/ACCC4CF8.asc && \
-    apt-key add ACCC4CF8.asc && \
+    wget -qO - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - && \
     echo "deb http://archive.ubuntu.com/ubuntu precise main universe multiverse" >> /etc/apt/sources.list && \
     echo "deb https://deb.nodesource.com/node_4.x trusty main" | tee /etc/apt/sources.list.d/nodesource.list && \
     echo "deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main" | tee /etc/apt/sources.list.d/postgresql.list && \