--- a/src/kntlm/des.cpp	2021-01-22 11:02:30.853883730 +1100
+++ b/src/kntlm/des.cpp	2021-01-22 11:05:15.670420646 +1100
@@ -26,6 +26,7 @@
 
 #include "des.h"
 
+#include <limits>
 #include <string.h>
 #include <qendian.h>