diff --git a/Dockerfile b/Dockerfile
index f36ec49..7917a92 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,6 +5,9 @@ FROM debian:9-slim
 LABEL maintainer="inf_sfb1288@lists.uni-bielefeld.de"
 
 
+ENV LANG=C.UTF-8
+
+
 # Install prerequisites
 RUN apt-get update \
  && apt-get install -y --no-install-recommends \