diff --git a/test/kernel/chunk_directory_test.cpp b/test/kernel/chunk_directory_test.cpp
index 427ede02..5e26bc39 100644
--- a/test/kernel/chunk_directory_test.cpp
+++ b/test/kernel/chunk_directory_test.cpp
@@ -56,13 +56,13 @@ TEST(ChunkDirectoryTest, EraseChunk) {
   ASSERT_GT(directory.size(), 0);
 
   directory.erase(chno0);
-  ASSERT_TRUE(directory.unused_chunk(chno0));
+  ASSERT_TRUE(chno0 >= directory.size() || directory.unused_chunk(chno0));
   directory.erase(chno1);
-  ASSERT_TRUE(directory.unused_chunk(chno1));
+  ASSERT_TRUE(chno1 >= directory.size() || directory.unused_chunk(chno1));
   directory.erase(chno2);
-  ASSERT_TRUE(directory.unused_chunk(chno2));
+  ASSERT_TRUE(chno2 >= directory.size() || directory.unused_chunk(chno2));
   directory.erase(chno3);
-  ASSERT_TRUE(directory.unused_chunk(chno3));
+  ASSERT_TRUE(chno3 >= directory.size() || directory.unused_chunk(chno3));
   ASSERT_EQ(directory.size(), 0);
 }