diff --git a/Dockerfile b/Dockerfile
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,11 +12,7 @@
 RUN apt-get update && apt-get install -y \
             mercurial subversion openssh-client locales clang-format-3.5 \
             --no-install-recommends && rm -r /var/lib/apt/lists/* && \
-    ln -s /usr/bin/clang-format-3.5 /usr/bin/clang-format && \
-    sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && \
-    echo 'LANG="en_US.UTF-8"' > /etc/default/locale && \
-    dpkg-reconfigure --frontend=noninteractive locales && \
-    update-locale LANG=en_US.UTF-8
+    ln -s /usr/bin/clang-format-3.5 /usr/bin/clang-format
 
 RUN cd /opt && \
     git clone https://github.com/phacility/libphutil.git && \
@@ -34,7 +30,6 @@
 # Docker properties
 #
 
-ENV LANG en_US.UTF-8
 VOLUME ["/opt/config", "/opt/workspace"]
 WORKDIR /opt/workspace
 CMD ["/usr/local/bin/arc"]