diff --git a/utest/objectmodel.test.cpp b/utest/objectmodel.test.cpp
index 194357c..69f652e 100644
--- a/utest/objectmodel.test.cpp
+++ b/utest/objectmodel.test.cpp
@@ -81,6 +81,7 @@
 #include <catch2/catch.hpp>
 #include <cmath>
 #include <cassert>
+#include <cstring>
 
 namespace xo {
     namespace ut {