diff --git a/t/t0004-unwritable.sh b/t/t0004-unwritable.sh
index 9255c63..63e1217 100755
--- a/t/t0004-unwritable.sh
+++ b/t/t0004-unwritable.sh
@@ -8,6 +8,7 @@
 
 	>file &&
 	git add file &&
+	test_tick &&
 	git commit -m initial &&
 	echo >file &&
 	git add file
@@ -17,11 +18,11 @@
 test_expect_success 'write-tree should notice unwritable repository' '
 
 	(
-		chmod a-w .git/objects
+		chmod a-w .git/objects .git/objects/?? &&
 		test_must_fail git write-tree
 	)
 	status=$?
-	chmod 775 .git/objects
+	chmod 775 .git/objects .git/objects/??
 	(exit $status)
 
 '
@@ -29,11 +30,11 @@
 test_expect_success 'commit should notice unwritable repository' '
 
 	(
-		chmod a-w .git/objects
+		chmod a-w .git/objects .git/objects/?? &&
 		test_must_fail git commit -m second
 	)
 	status=$?
-	chmod 775 .git/objects
+	chmod 775 .git/objects .git/objects/??
 	(exit $status)
 
 '
@@ -41,12 +42,12 @@
 test_expect_success 'update-index should notice unwritable repository' '
 
 	(
-		echo a >file &&
-		chmod a-w .git/objects
+		echo 6O >file &&
+		chmod a-w .git/objects .git/objects/?? &&
 		test_must_fail git update-index file
 	)
 	status=$?
-	chmod 775 .git/objects
+	chmod 775 .git/objects .git/objects/??
 	(exit $status)
 
 '
@@ -55,11 +56,11 @@
 
 	(
 		echo b >file &&
-		chmod a-w .git/objects
+		chmod a-w .git/objects .git/objects/?? &&
 		test_must_fail git add file
 	)
 	status=$?
-	chmod 775 .git/objects
+	chmod 775 .git/objects .git/objects/??
 	(exit $status)
 
 '