diff --git a/ci/lib.sh b/ci/lib.sh
index ad013e8cbe..3c64db5952 100644
--- a/ci/lib.sh
+++ b/ci/lib.sh
@@ -17,7 +17,7 @@ export branch="${target_branch:-main}"
 clone_tests_repo()
 {
 	if [ -d "$tests_repo_dir" ]; then
-		[ -n "$CI" ] && return
+		[ -n "${CI:-}" ] && return
 		pushd "${tests_repo_dir}"
 		git checkout "${branch}"
 		git pull