diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8f28ae49a94f27c788c825f4fb8c25d5c3fea934..6cc63ae3522001701bd428075240eb6538048c6a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -95,7 +95,7 @@ minimal-windows:
     - source activate pystencils
     - pip list
     - python -c "import numpy"
-    - py.test -v -n $NUM_CORES -m "not (notebook or longrun)"
+    - py.test -v -m "not (notebook or longrun)"
 
 ubuntu:
   stage: test