diff --git a/Dockerfile b/Dockerfile
index 9634928..e959535 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,5 +6,6 @@ RUN apk add --no-cache \
   openssh \
   vim \
   zsh
+ENV LANG=en_US.UTF-8 LC_CTYPE=en_US.UTF-8
 ADD zshrc /root/.zshrc
 CMD zsh