diff --git a/1.12/Dockerfile b/1.12/Dockerfile
index c56a0af5f..c2028c66c 100644
--- a/1.12/Dockerfile
+++ b/1.12/Dockerfile
@@ -10,7 +10,7 @@ ENV DOCKER_VERSION 1.12.0
 ENV DOCKER_SHA256 3dd07f65ea4a7b4c8829f311ab0213bca9ac551b5b24706f3e79a97e22097f8b
 
 RUN set -x \
-	&& curl -fSL "https://${DOCKER_BUCKET}/builds/Linux/x86_64/docker-$DOCKER_VERSION.tgz" -o docker.tgz \
+	&& curl -fSL "https://${DOCKER_BUCKET}/builds/Linux/x86_64/docker-${DOCKER_VERSION}.tgz" -o docker.tgz \
 	&& echo "${DOCKER_SHA256} *docker.tgz" | sha256sum -c - \
 	&& tar -xzvf docker.tgz \
 	&& mv docker/* /usr/local/bin/ \