diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index aaa8a0f5bb93052efb2f297c9d6689188e20b9dd..a83f166e0a0574060e8964e0e396e312f8d5a7d2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -21,7 +21,7 @@ tests:
   stage: test
   script:
     - cd nifty && python3 setup.py install --user -f && cd ..
-    - for file in *.py; do python3 $file &; done
+    - for file in *.py; do python3 $file ; done
   artifacts:
     paths:
       - '*.png'