diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e7adaa89a19abda83083118726eb454f9d0c2b03..f62acb28432f347066e0089359ea2bb64a57fd5a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -446,7 +446,7 @@ stages:
 
     ### compare the two csv files for regressions
     - regressions_found=0
-    - python3 scripts/basop_check_for_changes_in_testcases.py --xml_report $XML_REPORT_BRANCH $CSV_BRANCH $CSV_MAIN || regressions_found=$?
+    - python3 scripts/basop_check_for_changes_in_testcases.py --xml_report $XML_REPORT_BRANCH $CSV_MAIN $CSV_BRANCH || regressions_found=$?
 
     - if [ $exit_code -eq 1 ]; then echo "Differences encountered"; exit_code=$EXIT_CODE_NON_BE; fi
     - if [ $zero_errors_branch != 1 ]; then echo "Run errors encountered!"; exit_code=$EXIT_CODE_NON_BE; fi