diff --git a/.drone.yml b/.drone.yml
index a754e5e..c427355 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -20,12 +20,12 @@ steps:
     CXX: g++-10
     CXXFLAGS: -pipe -O2
     DEBIAN_FRONTEND: noninteractive
-    LANG: C.utf8
+    LANG: C.UTF-8
   commands:
   - rm /etc/apt/apt.conf.d/docker-clean
   - alias apt-get='rm -f /var/cache/apt/archives/lock && apt-get'
   - apt-get update -q
-  - apt-get install -qq build-essential cmake clang
+  - apt-get install -qq build-essential cmake clang locales
   - apt-get install -qq catch libboost-program-options-dev libboost-locale-dev gettext libarchive-dev libfmt-dev asciidoc
   - rm -rf build && mkdir -p build && cd build
   - cmake -G "Unix Makefiles" -DWITH_TESTS=YES ..
@@ -55,12 +55,12 @@ steps:
     CXX: g++-7
     CXXFLAGS: -pipe -O2
     DEBIAN_FRONTEND: noninteractive
-    LANG: C.utf8
+    LANG: C.UTF-8
   commands:
   - rm /etc/apt/apt.conf.d/docker-clean
   - alias apt-get='rm -f /var/cache/apt/archives/lock && apt-get'
   - apt-get update -q
-  - apt-get install -qq build-essential clang
+  - apt-get install -qq build-essential clang locales
   - apt-get install -qq catch libboost-program-options-dev libboost-locale-dev gettext libarchive-dev libfmt-dev asciidoc
   - sh cmake_installer.sh --skip-license --exclude-subdir --prefix=/usr/local
   - rm -rf build && mkdir -p build && cd build