diff --git a/tests/drone-run-php-tests.sh b/tests/drone-run-php-tests.sh
index ff4737b77a0..aad781a1c7b 100755
--- a/tests/drone-run-php-tests.sh
+++ b/tests/drone-run-php-tests.sh
@@ -24,4 +24,6 @@ echo "========================="
 
 [[ $(git diff --name-only origin/$DRONE_TARGET_BRANCH...$DRONE_COMMIT_SHA | grep -c "3rdparty") -gt 0 ]] && echo "3rdparty is modified" && exit 0
 
+[[ $(git diff --name-only origin/$DRONE_TARGET_BRANCH...$DRONE_COMMIT_SHA | grep -c "apps/theming/css") -gt 0 ]] && echo "theming css is modified" && exit 0
+
 exit 1