diff --git a/build/docker/ubuntu-artful/Dockerfile b/build/docker/ubuntu-artful/Dockerfile
index fe241c4..0b5b8ed 100644
--- a/build/docker/ubuntu-artful/Dockerfile
+++ b/build/docker/ubuntu-artful/Dockerfile
@@ -55,7 +55,7 @@
 RUN add-apt-repository ppa:haxe/releases -y
 
 # node.js
-RUN curl -sL https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add - \
+RUN curl -sL https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add - && \
     echo "deb https://deb.nodesource.com/node_8.x artful main" | tee /etc/apt/sources.list.d/nodesource.list
 
 ### install general dependencies