diff --git a/tools/gen-zam/src/Gen-ZAM.cc b/tools/gen-zam/src/Gen-ZAM.cc
index aa43d128fb..f9b05d7f47 100644
--- a/tools/gen-zam/src/Gen-ZAM.cc
+++ b/tools/gen-zam/src/Gen-ZAM.cc
@@ -2,6 +2,7 @@
 
 #include "Gen-ZAM.h"
 
+#include <cstring>
 #include <ctype.h>
 #include <regex>