diff --git a/bin/git-utimes b/bin/git-utimes
index 80d9d33..321b5fc 100755
--- a/bin/git-utimes
+++ b/bin/git-utimes
@@ -19,7 +19,7 @@ if [ "$1" = "--touch" ]; then
     git_s=$(git --no-pager log --no-renames --pretty=format:%ct -1 @ -- "$f" 2>/dev/null)
     mod_s=$(stat $stat_flags "$f" 2>/dev/null)
     if [ -n "$git_s" ] && [ -n "$mod_s" ] && [ "$mod_s" -ne "$git_s" ]; then
-      if [ "$mod_s" -gt "$git_s" ] || [ ! -n "$newer_flag" ]; then
+      if [ "$mod_s" -gt "$git_s" ] || [ -z "$newer_flag" ]; then
         t=$(date $date_flags$git_s '+%Y%m%d%H%M.%S')
         echo "+ touch -h -t $t $f" >&2
         touch -h -t "$t" "$f"
@@ -32,7 +32,6 @@ else
   # `-n` should be limited or parallelization will not give effect,
   # because all args will go into single worker.
   NPROC=$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || getconf _NPROCESSORS_ONLN 2>/dev/null)
-  # shellcheck disable=SC2086
   # don't touch files that have been modified in the worktree or index
   #   bsd doesn't have `-z` option for `comm` and `cut`, so use `tr` as work around
   prefix="$(git rev-parse --show-prefix) "