diff --git a/test/docker/debianstable b/test/docker/debianstable
index fe76d0db..884e15fc 100644
--- a/test/docker/debianstable
+++ b/test/docker/debianstable
@@ -3,7 +3,7 @@ FROM debian:stable
 ENV DEBIAN_FRONTEND noninteractive
 
 RUN apt-get update
-RUN apt-get install -y build-essential cmake git uuid-dev libgnutls28-dev libfaketime man
+RUN apt-get install -y build-essential cmake git uuid-dev libgnutls28-dev libfaketime man locales
 RUN apt-get install -y python
 
 RUN apt-get install -y tzdata
diff --git a/test/docker/debiantesting b/test/docker/debiantesting
index b02e913c..b86829e8 100644
--- a/test/docker/debiantesting
+++ b/test/docker/debiantesting
@@ -3,7 +3,7 @@ FROM debian:testing
 ENV DEBIAN_FRONTEND noninteractive
 
 RUN apt-get update
-RUN apt-get install -y build-essential cmake git uuid-dev libgnutls28-dev libfaketime man
+RUN apt-get install -y build-essential cmake git uuid-dev libgnutls28-dev libfaketime man locales
 RUN apt-get install -y python
 
 RUN apt-get install -y tzdata