diff --git a/Dockerfile b/Dockerfile
index 2cb00aa..1ff1927 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,7 @@ RUN echo "deb http://deb.debian.org/debian buster non-free" >> /etc/apt/sources.
 	&& rm -rf /var/lib/apt/lists/* /tmp/*
 
 # Add in Leenooks' apt repository
-RUN curl -sL http://apt.leenooks.net/setup.sh | sh buster
+RUN curl -sL http://apt.leenooks.net/setup.sh | DISTRO=buster bash
 
 RUN apt-get update \
 	&& apt-get install -yqq wkhtmltox \