diff --git a/ci/clean.sh b/ci/clean.sh
index 92637b5a..df4a6beb 100755
--- a/ci/clean.sh
+++ b/ci/clean.sh
@@ -3,7 +3,7 @@
 set -euo pipefail
 
 main() {
-  git clean -xffd
+  git clean -Xffd
   git submodule foreach --recursive git clean -xffd
   git submodule foreach --recursive git reset --hard
 }