diff --git a/clang-format-all b/clang-format-all
index 645c3ce..7934e6c 100755
--- a/clang-format-all
+++ b/clang-format-all
@@ -78,6 +78,7 @@ for dir in "$@"; do
          -o -name '*.cpp' \
          -o -name '*.h' \
          -o -name '*.hh' \
+         -o -name '*.hxx' \
          -o -name '*.hpp' \) \
          -exec "${FMT}" -i '{}' \;
     popd &>/dev/null