diff --git a/.github/actions/test_tests-phpunit.sh b/.github/actions/test_tests-phpunit.sh
index dea388d14d8..c0efa99120a 100755
--- a/.github/actions/test_tests-phpunit.sh
+++ b/.github/actions/test_tests-phpunit.sh
@@ -2,7 +2,7 @@
 set -e -u -x -o pipefail
 
 PHPUNIT_ADDITIONNAL_OPTIONS=""
-if [[ "$CODE_COVERAGE" = true ]]; then
+if [[ "${CODE_COVERAGE:-}" = true ]]; then
   export COVERAGE_DIR="coverage-functional"
   PHPUNIT_ADDITIONNAL_OPTIONS="--coverage-filter src --coverage-clover phpunit/$COVERAGE_DIR/clover.xml"