diff --git a/src/network/leaseshelper.c b/src/network/leaseshelper.c
index e53a73c668..b6f6c32b50 100644
--- a/src/network/leaseshelper.c
+++ b/src/network/leaseshelper.c
@@ -25,6 +25,7 @@
 
 #include <config.h>
 
+#include <locale.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>