diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 40e860ffae61312971778c021a6a16760a34ab83..87b1eaf98d8590943cc34eaef2bdf5403eaca6fe 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,7 @@
 ---
 variables:
   GIT_SUBMODULE_STRATEGY: recursive
+  HYPERTHREADING: "false"
 
 before_script:
   - echo "Running make concurrently with ${DUNECI_PARALLEL} cores, where possibly"