diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bed1e5a..b7a3182 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,6 +4,7 @@
 # License: GPL-3.0+
 
 variables:
+  DOCKER_TLS_CERTDIR: "/certs"
   DEBIAN_VERSION: jessie-20180426
   DEVUAN_RELEASE: ascii
   TZ: UTC