diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index c43bc6870a..a006ef1ee1 100755
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -234,21 +234,33 @@ test_expect_success 'tree object with duplicate entries' '
 	test_i18ngrep "error in tree .*contains duplicate file entries" out
 '
 
-test_expect_success 'tree object with dublicate names' '
-	test_when_finished "remove_object \$blob" &&
-	test_when_finished "remove_object \$tree" &&
-	test_when_finished "remove_object \$badtree" &&
-	blob=$(echo blob | git hash-object -w --stdin) &&
-	printf "100644 blob %s\t%s\n" $blob x.2 >tree &&
-	tree=$(git mktree <tree) &&
-	printf "100644 blob %s\t%s\n" $blob x.1 >badtree &&
-	printf "100644 blob %s\t%s\n" $blob x >>badtree &&
-	printf "040000 tree %s\t%s\n" $tree x >>badtree &&
-	badtree=$(git mktree <badtree) &&
-	test_must_fail git fsck 2>out &&
-	test_i18ngrep "$badtree" out &&
-	test_i18ngrep "error in tree .*contains duplicate file entries" out
-'
+check_duplicate_names () {
+	expect=$1 &&
+	shift &&
+	names=$@ &&
+	test_expect_$expect "tree object with duplicate names: $names" '
+		test_when_finished "remove_object \$blob" &&
+		test_when_finished "remove_object \$tree" &&
+		test_when_finished "remove_object \$badtree" &&
+		blob=$(echo blob | git hash-object -w --stdin) &&
+		printf "100644 blob %s\t%s\n" $blob x.2 >tree &&
+		tree=$(git mktree <tree) &&
+		for name in $names
+		do
+			case "$name" in
+			*/) printf "040000 tree %s\t%s\n" $tree "${name%/}" ;;
+			*)  printf "100644 blob %s\t%s\n" $blob "$name" ;;
+			esac
+		done >badtree &&
+		badtree=$(git mktree <badtree) &&
+		test_must_fail git fsck 2>out &&
+		test_i18ngrep "$badtree" out &&
+		test_i18ngrep "error in tree .*contains duplicate file entries" out
+	'
+}
+
+check_duplicate_names success x x.1 x/
+check_duplicate_names success x x.1.2 x.1/ x/
 
 test_expect_success 'unparseable tree object' '
 	test_oid_cache <<-\EOF &&