diff --git a/Dockerfile b/Dockerfile
index acf5ae3df73d35..f4b8f2d69b8c64 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-from ubuntu:16.04
+FROM ubuntu:16.04
 
 RUN apt-get update && apt-get install -y libzmq3-dev capnproto libcapnp-dev clang wget git autoconf libtool curl make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev libffi-dev liblzma-dev python-openssl