diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 697c71f05..50400e736 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -151,8 +151,8 @@ check-code-style:
   script:
     - if [[ x"$CI_MERGE_REQUEST_TARGET_BRANCH_NAME" != "x" ]] ;
       then
-        git fetch origin master;
-        export common_parent_sha=$(diff --old-line-format='' --new-line-format='' <(git rev-list --first-parent "origin/${CI_MERGE_REQUEST_TARGET_BRANCH_NAME:-${CI_DEFAULT_BRANCH}}") <(git rev-list --first-parent HEAD) | head -1) ;
+        git fetch origin $CI_MERGE_REQUEST_TARGET_BRANCH_NAME ;
+        export common_parent_sha=$(diff --old-line-format='' --new-line-format='' <(git rev-list --first-parent "origin/$CI_MERGE_REQUEST_TARGET_BRANCH_NAME") <(git rev-list --first-parent HEAD) | head -1) ;
         python3 -u ./check-style.py --dry-run --sha $common_parent_sha ;
       else
         echo "Not a merge request" ;