diff --git a/src/common/tuklib_exit.c b/src/common/tuklib_exit.c
index c393be64..aa55620e 100644
--- a/src/common/tuklib_exit.c
+++ b/src/common/tuklib_exit.c
@@ -14,6 +14,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 
 #include "tuklib_gettext.h"
 #include "tuklib_progname.h"