diff --git a/test/test_message_cache.cc b/test/test_message_cache.cc
index 6c35b1b..0c6a479 100644
--- a/test/test_message_cache.cc
+++ b/test/test_message_cache.cc
@@ -4,6 +4,7 @@
 #include "framework.hh"
 #include <iostream>
 #include <cassert>
+#include <cstring>
 #include <sys/param.h>
 #include <unistd.h>
 #include <message_cache.hh>