diff --git a/expat/apply-clang-tidy.sh b/expat/apply-clang-tidy.sh
index 17246c40..7c17fbd8 100755
--- a/expat/apply-clang-tidy.sh
+++ b/expat/apply-clang-tidy.sh
@@ -75,6 +75,7 @@ else
     # https://github.com/libexpat/libexpat/issues/119
     files=( $(
         git ls-files -- \*.c | grep -v \
+        -e '^lib/xcsinc\.c$' \
         -e '^xmlwf/ct\.c$' \
         -e '^xmlwf/xmlmime\.c$' \
         -e '^xmlwf/win32filemap\.c$' \