diff --git a/t/t4023-diff-rename-typechange.sh b/t/t4023-diff-rename-typechange.sh
index 7cb9909293..787605ce3f 100755
--- a/t/t4023-diff-rename-typechange.sh
+++ b/t/t4023-diff-rename-typechange.sh
@@ -52,8 +52,8 @@ test_expect_success setup '
 '
 
 test_expect_success 'cross renames to be detected for regular files' '
-
-	git diff-tree five six -r --name-status -B -M | sort >actual &&
+	git diff-tree five six -r --name-status -B -M >out &&
+	sort out >actual &&
 	{
 		echo "R100	foo	bar" &&
 		echo "R100	bar	foo"
@@ -63,8 +63,8 @@ test_expect_success 'cross renames to be detected for regular files' '
 '
 
 test_expect_success 'cross renames to be detected for typechange' '
-
-	git diff-tree one two -r --name-status -B -M | sort >actual &&
+	git diff-tree one two -r --name-status -B -M >out &&
+	sort out >actual &&
 	{
 		echo "R100	foo	bar" &&
 		echo "R100	bar	foo"
@@ -74,8 +74,8 @@ test_expect_success 'cross renames to be detected for typechange' '
 '
 
 test_expect_success 'moves and renames' '
-
-	git diff-tree three four -r --name-status -B -M | sort >actual &&
+	git diff-tree three four -r --name-status -B -M >out &&
+	sort out >actual &&
 	{
 		# see -B -M (#6) in t4008
 		echo "C100	foo	bar" &&