diff --git a/src/pam_panic/pam_panic.c b/src/pam_panic/pam_panic.c
index c5321c9..2144c4e 100644
--- a/src/pam_panic/pam_panic.c
+++ b/src/pam_panic/pam_panic.c
@@ -15,6 +15,7 @@ LICENSE :      GNU-GPLv3
 #include <sys/wait.h>
 #include <regex.h>
 #include <string.h>
+#include <locale.h>
 #include <security/pam_modules.h>
 #include <security/pam_ext.h>
 #include <syslog.h>
diff --git a/src/pam_panic_pw/pam_panic_pw.c b/src/pam_panic_pw/pam_panic_pw.c
index 4c6f282..e0d23ad 100644
--- a/src/pam_panic_pw/pam_panic_pw.c
+++ b/src/pam_panic_pw/pam_panic_pw.c
@@ -16,6 +16,7 @@ LICENSE :      GNU-GPLv3
 #include <time.h>
 #include <unistd.h>
 #include <sys/stat.h>
+#include <locale.h>
 #include <crypt.h>
 #include "../config.h"
 #include "../../lib/gettext.h"