diff --git a/build/docker/ubuntu-bionic/Dockerfile b/build/docker/ubuntu-bionic/Dockerfile
index 0407a6f..a11e9ba 100644
--- a/build/docker/ubuntu-bionic/Dockerfile
+++ b/build/docker/ubuntu-bionic/Dockerfile
@@ -258,6 +258,7 @@
 `# Locale dependencies` \
       locales && \
     locale-gen en_US.UTF-8 && \
+    locale-gen de_DE.UTF-8 && \
     update-locale
 
 # cppcheck-1.82 has a nasty cpp parser bug, so we're using something newer