diff --git a/docker/Dockerfile-build b/docker/Dockerfile-build
index 786737a10..114b230c9 100644
--- a/docker/Dockerfile-build
+++ b/docker/Dockerfile-build
@@ -10,7 +10,7 @@ ENV PYTHONUNBUFFERED=1 \
 
 RUN \
 	echo "Install base packages" \
-	&& ([ -z "$HTTP_PROXY" ] || echo "Acquire::http::Proxy \"${HTTP_PROXY}\";\n" > /etc/apt/apt.conf.d/99HttpProxy) \
+	&& ([ -z "$HTTP_PROXY" ] || echo "Acquire::http::Proxy \"${HTTP_PROXY}\";" > /etc/apt/apt.conf.d/99HttpProxy) \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends \
 		apt-transport-https \
@@ -39,7 +39,7 @@ RUN \
 
 	&& echo "Install nodejs" \
 	&& cd /tmp \
-	&& curl -sSLO https://deb.nodesource.com/node_6.x/pool/main/n/nodejs/nodejs_${NODEJS_VERSION}_amd64.deb \
+	&& curl -x "$HTTP_PROXY" -sSLO https://deb.nodesource.com/node_6.x/pool/main/n/nodejs/nodejs_${NODEJS_VERSION}_amd64.deb \
 	&& dpkg -i /tmp/nodejs_${NODEJS_VERSION}_amd64.deb \
 
 	&& echo "Clean up" \