diff --git a/arp_packet_unittest.cc b/arp_packet_unittest.cc
index a6fda5a..a952718 100644
--- a/arp_packet_unittest.cc
+++ b/arp_packet_unittest.cc
@@ -32,7 +32,7 @@
 const uint8 kInsertedByte[] = { 0x00 };
 const size_t kArpPaddingSizeV4 = 18;
 const size_t kArpPaddingSizeV6 = 0;
-}  // namespace {}
+}  // namespace
 
 class ArpPacketTest : public Test {
  public: