diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2776cd2ca8065f94d883d1ba1ee246939516a002..0373c39dc6d7e85dd70aabd779006b01fbd6f7e0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,23 +2,15 @@
 debian:10 gcc-8-17:
   image: registry.dune-project.org/docker/ci/dune:2.6-debian-10-gcc-8-17
   script: duneci-standard-test
-  variables:
-    DUNECI_TOOLCHAIN: gcc-8-17
 
 debian:10 clang-6-libcpp-17:
   image: registry.dune-project.org/docker/ci/dune:2.6-debian-10-clang-6-libcpp-17
   script: duneci-standard-test
-  variables:
-    DUNECI_TOOLCHAIN: clang-6-libcpp-17
 
 debian:9 gcc-6-14:
   image: registry.dune-project.org/docker/ci/dune:2.6-debian-9-gcc-6-14
   script: duneci-standard-test
-  variables:
-    DUNECI_TOOLCHAIN: gcc-6-14
 
 ubuntu:18.04 clang-6-17:
   image: registry.dune-project.org/docker/ci/dune:2.6-ubuntu-18.04-clang-6-17
   script: duneci-standard-test
-  variables:
-    DUNECI_TOOLCHAIN: clang-6-17