diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ced11e2..c71eb37 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -29,7 +29,7 @@ test-job:        # This job runs in the test stage.
       then 
         files=$(find . -name "*.zone" -printf %P)
       else
-        files=$(git diff-tree --no-commit-id --name-only -r $CI_COMMIT_SHA)
+        files=$(git diff-tree --no-commit-id --name-only -r $CI_COMMIT_SHA | tr "\n" " ")
       fi
       if [[ "$files" =~ .*"zone".* ]]
       then