diff --git a/Dockerfile.danger b/Dockerfile.danger
index 19e143f..7a418a8 100644
--- a/Dockerfile.danger
+++ b/Dockerfile.danger
@@ -1,6 +1,11 @@
 FROM ruby:2.6-stretch
 MAINTAINER GitLab Quality Team
 
+# Danger manipulates git diff output. When an unicode char is present in the diff, it chokes with
+# (Danger::DSLError) [!] Invalid `Dangerfile` file: invalid byte sequence in US-ASCII
+# eg. https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/275286625
+ENV LC_ALL "C.UTF-8"
+
 ADD /scripts/ /scripts/
 
 RUN apt-get update \