diff --git a/build/windows/gitlab-ci/2_build-gimp-crossroad.sh b/build/windows/gitlab-ci/2_build-gimp-crossroad.sh
index 18c703f677..9ab86b8d19 100644
--- a/build/windows/gitlab-ci/2_build-gimp-crossroad.sh
+++ b/build/windows/gitlab-ci/2_build-gimp-crossroad.sh
@@ -21,10 +21,10 @@ fi
 if [ ! -d '_build-x64' ]; then
   echo -e '\033[31m(ERROR)\033[0m: Before running this script, first build GIMP natively in _build-x64'
 fi
-if [ ! -d '../_install-x64' ]; then
-  echo -e '\033[31m(ERROR)\033[0m: Before running this script, first install GIMP natively in ../_install-x64'
+if [ ! -d "${PARENT_DIR}_install-x64" ]; then
+  echo -e "\033[31m(ERROR)\033[0m: Before running this script, first install GIMP natively in ${PARENT_DIR}_install-x64"
 fi
-if [ ! -d '_build-x64' ] || [ ! -d '../_install-x64' ]; then
+if [ ! -d '_build-x64' ] || [ ! -d "${PARENT_DIR}_install-x64" ]; then
   echo 'Patches are very welcome: https://gitlab.gnome.org/GNOME/gimp/-/issues/11544'
   exit 1
 fi