diff --git a/Dockerfile b/Dockerfile
index 397175a..61fe297 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,9 +3,8 @@ FROM debian:stable
 # APT-cache for all
 RUN sed -i 's@deb.debian.org@apt-cache.lan/deb.debian.org@g' /etc/apt/sources.list && \
 	sed -i 's@security.debian.org@apt-cache.lan/security.debian.org@g' /etc/apt/sources.list && \
-    echo 'deb-src http://apt-cache.lan/deb.debian.org/debian stable main' > /etc/apt/sources.list.d/src.list
-
-RUN dpkg --add-architecture armhfapt-get update -y && \
+    echo 'deb-src http://apt-cache.lan/deb.debian.org/debian stable main' > /etc/apt/sources.list.d/src.list && \
+    dpkg --add-architecture armhfapt-get update -y && \
 	apt-get install -y \
 	build-essential dpkg-dev dpkg-cross \
 	devscripts make ccache distcc \