diff --git a/etc/ci/manifest_changed.sh b/etc/ci/manifest_changed.sh
index b8c2c536f54..7ad9efa0821 100755
--- a/etc/ci/manifest_changed.sh
+++ b/etc/ci/manifest_changed.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 ./mach test-wpt --manifest-update SKIP_TESTS > /dev/null
+./mach test-css --manifest-update SKIP_TESTS > /dev/null
 diff=$(git diff -- tests/*/MANIFEST.json)
 echo "$diff"
 [[ ! $diff ]]