diff --git a/mk/acconfig.h b/mk/acconfig.h
index bbe53d498305caea3a6483cb36b5ba022fdea098..fba81e616428fe1165e3e8dab3441737e9c65edf 100644
--- a/mk/acconfig.h
+++ b/mk/acconfig.h
@@ -4,3 +4,6 @@
 /* Define this if your time.h defines altzone */
 #undef HAVE_ALTZONE
 
+/* Define as the type of timezone.  */
+#undef TYPE_TIMEZONE
+
diff --git a/mk/config.h.in b/mk/config.h.in
index 544ee91cc62f2023bd328ece0d7032c11beeba1b..0596c444ceb0dd5627f8691ec9e089c3e81e6ec4 100644
--- a/mk/config.h.in
+++ b/mk/config.h.in
@@ -6,6 +6,9 @@
 /* Define as the return type of signal handlers (int or void).  */
 #undef RETSIGTYPE
 
+/* Define as the type of timezone.  */
+#undef TYPE_TIMEZONE
+
 /* Define if you have the ANSI C header files.  */
 #undef STDC_HEADERS