diff --git a/src/vpndrvinst/main.c b/src/vpndrvinst/main.c
index 658f92a1..e947ac97 100644
--- a/src/vpndrvinst/main.c
+++ b/src/vpndrvinst/main.c
@@ -2,6 +2,7 @@
 #include "Dialog.h"
 
 #include <stdio.h>
+#include <string.h>
 
 void ShowUsage()
 {