diff --git a/tests/test-tokenizer-1.cpp b/tests/test-tokenizer-1.cpp
index 91464b850..be038389b 100644
--- a/tests/test-tokenizer-1.cpp
+++ b/tests/test-tokenizer-1.cpp
@@ -2,6 +2,7 @@
 
 #include <cassert>
 #include <cstdio>
+#include <cstring>
 #include <string>
 #include <codecvt>
 #include <map>