diff --git a/test/lexer.t.cpp b/test/lexer.t.cpp
index 786851a44..70825e2df 100644
--- a/test/lexer.t.cpp
+++ b/test/lexer.t.cpp
@@ -27,6 +27,7 @@
 #include <cmake.h>
 #include <iostream>
 #include <vector>
+#include <string.h>
 #include <test.h>
 #include <Lexer.h>
 #include <Context.h>