diff --git a/testing/v8_initializer.cpp b/testing/v8_initializer.cpp
index 49ef257..1083984 100644
--- a/testing/v8_initializer.cpp
+++ b/testing/v8_initializer.cpp
@@ -4,6 +4,8 @@
 
 #include "testing/v8_initializer.h"
 
+#include <cstring>
+
 #include "public/fpdfview.h"
 #include "testing/utils/file_util.h"
 #include "testing/utils/path_service.h"