diff --git a/Dockerfile b/Dockerfile
index 4feb282..873c89c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,6 +5,7 @@ RUN set -eux && \
     DEBIAN_FRONTEND=noninteractive apt-get upgrade -y && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
         openssh-server \
+        locales \
         curl \
         telnet \
         net-tools \
@@ -12,7 +13,10 @@ RUN set -eux && \
         vim \
     && \
     rm -rf /var/lib/apt/lists/* && \
-    rm /etc/ssh/ssh_host_*key*
+    rm /etc/ssh/ssh_host_*key* && \
+    echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen && \
+    /usr/sbin/locale-gen && \
+    /usr/sbin/update-locale 'LANG=en_US.UTF-8'
 
 ADD start.sh /