diff --git a/diff.c b/diff.c
index 3b40e597d5793d13944f9604e5197ac216eb3a3e..004a46b529d162fcac070796f8d91d69ef1f5310 100644
--- a/diff.c
+++ b/diff.c
@@ -1502,8 +1502,8 @@ static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
 	 *    under this directory (sources == 1).
 	 */
 	if (baselen && sources != 1) {
-		int permille = this_dir * 1000 / changed;
-		if (permille) {
+		if (this_dir) {
+			int permille = this_dir * 1000 / changed;
 			int percent = permille / 10;
 			if (percent >= dir->percent) {
 				fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
diff --git a/t/t4047-diff-dirstat.sh b/t/t4047-diff-dirstat.sh
index ce7c4033f8e54f3ee352fa559b9b3b7a4bb71837..1c5adadf3266dab844bd7b9db97c76c9bb8b7804 100755
--- a/t/t4047-diff-dirstat.sh
+++ b/t/t4047-diff-dirstat.sh
@@ -351,7 +351,6 @@ test_expect_success 'vanilla -X' '
 	test_cmp expect_diff_dirstat_CC actual_diff_dirstat_CC
 '
 
-# rearranged/text falls below 0% threshold (1 / (240 * 9 + 48 + 1) ~= 0.045 %)
 cat <<EOF >expect_diff_dirstat
    2.1% changed/
   10.8% dst/copy/changed/
@@ -360,6 +359,7 @@ cat <<EOF >expect_diff_dirstat
   10.8% dst/move/changed/
   10.8% dst/move/rearranged/
   10.8% dst/move/unchanged/
+   0.0% rearranged/
   10.8% src/move/changed/
   10.8% src/move/rearranged/
   10.8% src/move/unchanged/
@@ -402,7 +402,6 @@ test_expect_success '-X0' '
 	test_cmp expect_diff_dirstat_CC actual_diff_dirstat_CC
 '
 
-# rearranged/text falls below 0% threshold (1 / (240 * 9 + 48 + 1) ~= 0.045 %)
 cat <<EOF >expect_diff_dirstat
    2.1% changed/
   10.8% dst/copy/changed/
@@ -414,6 +413,7 @@ cat <<EOF >expect_diff_dirstat
   10.8% dst/move/unchanged/
   32.5% dst/move/
   65.1% dst/
+   0.0% rearranged/
   10.8% src/move/changed/
   10.8% src/move/rearranged/
   10.8% src/move/unchanged/