diff --git a/contrib/tzcode/zic.c b/contrib/tzcode/zic.c
--- a/contrib/tzcode/zic.c
+++ b/contrib/tzcode/zic.c
@@ -1842,7 +1842,7 @@
 static void
 inrule(char **fields, int nfields)
 {
-	struct rule r;
+	struct rule r = { 0 };
 
 	if (nfields != RULE_FIELDS) {
 		error(_("wrong number of fields on Rule line"));
@@ -1921,7 +1921,7 @@
 {
 	register char *		cp;
 	char *			cp1;
-	struct zone z;
+	struct zone		z = { 0 };
 	int format_len;
 	register int		i_stdoff, i_rule, i_format;
 	register int		i_untilyear, i_untilmonth;