diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8f4e716343f196acef8a9348a9c371eabad23758..6059bf10686d4a23a6e9f8d93ed9d135164d0bfc 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,7 @@
 image: docker:stable
-  # When using dind, it's wise to use the overlayfs driver for
-  # improved performance.
-  DOCKER_DRIVER: overlay2
+
+variables:
+ DOCKER_DRIVER: overlay2
 
 services:
   - docker:dind