diff --git a/util/arena_test.cc b/util/arena_test.cc
index 4a3d1bd433950f4e286b76b7237cde0dcc00081e..ca6dfc99d6ea1208a92f2c0b6c43ab49e324eb33 100644
--- a/util/arena_test.cc
+++ b/util/arena_test.cc
@@ -62,8 +62,9 @@ TEST(ArenaImplTest, MemoryAllocatedBytes) {
 TEST(ArenaImplTest, ApproximateMemoryUsageTest) {
   const size_t kBlockSize = 4096;
   const size_t kEntrySize = kBlockSize / 8;
+	const size_t kZero = 0;
   ArenaImpl arena(kBlockSize);
-  ASSERT_EQ(0, arena.ApproximateMemoryUsage());
+  ASSERT_EQ(kZero, arena.ApproximateMemoryUsage());
 
   auto num_blocks = kBlockSize / kEntrySize;