--- a/tests/signals/convert_slot_test.cc
+++ b/tests/signals/convert_slot_test.cc
@@ -2,6 +2,7 @@
 #include <iostream>
 #include <sigc++/signal_system.h>
 #include <sigc++/convert.h>
+#include <cstring>
 
 /*
 Copyright 1999, Karl Nelson