diff --git a/docker/Dockerfile b/docker/Dockerfile
index 1ed9cf2db..6dc7f4581 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -31,3 +31,10 @@ run apt-get -y install libpq-dev
 
 # backend-dependencies
 run apt-get -y install pkg-config
+
+run apt-get -y install locales
+run sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && \
+    locale-gen
+env LANG en_US.UTF-8
+env LANGUAGE en_US:en
+env LC_ALL en_US.UTF-8