diff --git a/build/Dockerfile b/build/Dockerfile
index 8ff44c1..07d7c6e 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -3,11 +3,9 @@ ARG USER_UID=1000
 
 FROM ubuntu:latest
 
-ENV DEBIAN_FRONTEND=noninteractive
-
 COPY start-container /usr/local/bin/start-container
 
-RUN apt-get -y update \
+RUN DEBIAN_FRONTEND=noninteractive && apt-get -y update \
 	&& apt-get install -y php php-xml php-curl php-xml php-mbstring composer npm \
 	&& useradd --home-dir=/var/www/html --uid=$USER_UID $USERNAME \
     && chmod +x /usr/local/bin/start-container