diff --git a/Dockerfile b/Dockerfile
index 401c90b..b49e566 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,8 +2,12 @@ FROM debian
 
 ENV HOME /tmp
 
+RUN set -ex \
+ && apt-get update \
+ && apt-get install -y gnupg2
+
 ADD https://dl-ssl.google.com/linux/linux_signing_key.pub /tmp/linux_signing_key.pub
-ADD google.list /etc/apt/sources.list.d/google.list'
+ADD google.list /etc/apt/sources.list.d/google.list
 
 RUN set -ex \
  && apt-key add /tmp/linux_signing_key.pub \