diff --git a/libtests/cxx11.cc b/libtests/cxx11.cc
index fa1dc6b..91ed7b1 100644
--- a/libtests/cxx11.cc
+++ b/libtests/cxx11.cc
@@ -1,5 +1,6 @@
 #include <iostream>
 #include <cassert>
+#include <cstring>
 #include <functional>
 #include <type_traits>
 #include <cstdint>