diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 642128a..b95429b 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -370,6 +370,7 @@
 
 pre_check_git () {
     if [ $FORCE -eq 1 ]; then
+        rm -rf "$OUT_OF_SOURCE_DIR"
         git checkout-index -f -q $CONFIG_H
         cleanup
     else