diff --git a/bin/tests/system/autosign/clean.sh b/bin/tests/system/autosign/clean.sh
index 7a1101d6dd..20efc69499 100644
--- a/bin/tests/system/autosign/clean.sh
+++ b/bin/tests/system/autosign/clean.sh
@@ -22,7 +22,7 @@ rm -f delayksk.key delayzsk.key autoksk.key autozsk.key
 rm -f dig.out.*
 rm -f digcomp.out.test*
 rm -f digcomp.out.test*
-rm -f missingzsk.key inactivezsk.key
+rm -f noksk-ksk.key nozsk-ksk.key nozsk-zsk.key inaczsk-zsk.key inaczsk-ksk.key
 rm -f nopriv.key vanishing.key del1.key del2.key
 rm -f ns*/managed-keys.bind*
 rm -f ns*/named.lock
@@ -43,6 +43,7 @@ rm -f ns3/jitter.nsec3.example.db
 rm -f ns3/kg.out ns3/s.out ns3/st.out
 rm -f ns3/kskonly.example.db
 rm -f ns3/named.ns3.prev
+rm -f ns3/noksk.example.db
 rm -f ns3/nozsk.example.db ns3/inaczsk.example.db
 rm -f ns3/nsec.example.db
 rm -f ns3/nsec3-to-nsec.example.db
diff --git a/bin/tests/system/autosign/ns3/keygen.sh b/bin/tests/system/autosign/ns3/keygen.sh
index cc3462a727..1a0615c621 100644
--- a/bin/tests/system/autosign/ns3/keygen.sh
+++ b/bin/tests/system/autosign/ns3/keygen.sh
@@ -249,15 +249,27 @@ echo $ksk > ../delayksk.key
 zsk=`$KEYGEN -G -q -a RSASHA1 -3 $zone 2> kg.out` || dumpit kg.out
 echo $zsk > ../delayzsk.key
 
+#
+# A zone with signatures that are already expired, and the private KSK
+# is missing.
+#
+setup noksk.example
+ksk=`$KEYGEN -q -a RSASHA1 -3 -fk $zone 2> kg.out` || dumpit kg.out
+zsk=`$KEYGEN -q -a RSASHA1 -3 $zone 2> kg.out` || dumpit kg.out
+$SIGNER -S -P -s now-1mo -e now-1mi -o $zone -f $zonefile ${zonefile}.in > s.out || dumpit s.out
+echo $ksk > ../noksk-ksk.key
+rm -f ${ksk}.private
+
 #
 # A zone with signatures that are already expired, and the private ZSK
 # is missing.
 #
 setup nozsk.example
-$KEYGEN -q -a RSASHA1 -3 -fk $zone > kg.out 2>&1 || dumpit kg.out
-zsk=`$KEYGEN -q -a RSASHA1 -3 $zone`
+ksk=`$KEYGEN -q -a RSASHA1 -3 -fk $zone 2> kg.out` || dumpit kg.out
+zsk=`$KEYGEN -q -a RSASHA1 -3 $zone 2> kg.out` || dumpit kg.out
 $SIGNER -S -P -s now-1mo -e now-1mi -o $zone -f $zonefile ${zonefile}.in > s.out || dumpit s.out
-echo $zsk > ../missingzsk.key
+echo $ksk > ../nozsk-ksk.key
+echo $zsk > ../nozsk-zsk.key
 rm -f ${zsk}.private
 
 #
@@ -265,10 +277,11 @@ rm -f ${zsk}.private
 # is inactive.
 #
 setup inaczsk.example
-$KEYGEN -q -a RSASHA1 -3 -fk $zone > kg.out 2>&1 || dumpit kg.out
-zsk=`$KEYGEN -q -a RSASHA1 -3 $zone`
+ksk=`$KEYGEN -q -a RSASHA1 -3 -fk $zone 2> kg.out` || dumpit kg.out
+zsk=`$KEYGEN -q -a RSASHA1 -3 $zone 2> kg.out` || dumpit kg.out
 $SIGNER -S -P -s now-1mo -e now-1mi -o $zone -f $zonefile ${zonefile}.in > s.out || dumpit s.out
-echo $zsk > ../inactivezsk.key
+echo $ksk > ../inaczsk-ksk.key
+echo $zsk > ../inaczsk-zsk.key
 $SETTIME -I now $zsk > st.out 2>&1 || dumpit st.out
 
 #
diff --git a/bin/tests/system/autosign/ns3/named.conf.in b/bin/tests/system/autosign/ns3/named.conf.in
index 7751cc2e42..5cdbd7a0b5 100644
--- a/bin/tests/system/autosign/ns3/named.conf.in
+++ b/bin/tests/system/autosign/ns3/named.conf.in
@@ -249,6 +249,13 @@ zone "inaczsk.example" {
 	auto-dnssec maintain;
 };
 
+zone "noksk.example" {
+	type primary;
+	file "noksk.example.db";
+	allow-update { any; };
+	auto-dnssec maintain;
+};
+
 zone "sync.example" {
 	type primary;
 	file "sync.example.db";
diff --git a/bin/tests/system/autosign/ns3/noksk.example.db.in b/bin/tests/system/autosign/ns3/noksk.example.db.in
new file mode 100644
index 0000000000..90dcba9daf
--- /dev/null
+++ b/bin/tests/system/autosign/ns3/noksk.example.db.in
@@ -0,0 +1,24 @@
+; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+;
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0. If a copy of the MPL was not distributed with this
+; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
+$TTL 300	; 5 minutes
+@			IN SOA	mname1. . (
+				1          ; serial
+				20         ; refresh (20 seconds)
+				20         ; retry (20 seconds)
+				1814400    ; expire (3 weeks)
+				3600       ; minimum (1 hour)
+				)
+			NS	ns
+ns			A	10.53.0.3
+
+a			A	10.0.0.1
+b			A	10.0.0.2
+d			A	10.0.0.4
+x			CNAME	a
diff --git a/bin/tests/system/autosign/tests.sh b/bin/tests/system/autosign/tests.sh
index 1e02683668..11ee65e068 100755
--- a/bin/tests/system/autosign/tests.sh
+++ b/bin/tests/system/autosign/tests.sh
@@ -164,7 +164,7 @@ do
 		grep "NS SOA" dig.out.ns2.test$n > /dev/null || ret=1
 	done
 	for z in bar. example. inacksk2.example. inacksk3.example \
-		 inaczsk2.example. inaczsk3.example
+		 inaczsk2.example. inaczsk3.example noksk.example nozsk.example
 	do
 		$DIG $DIGOPTS $z @10.53.0.3 nsec > dig.out.ns3.test$n || ret=1
 		grep "NS SOA" dig.out.ns3.test$n > /dev/null || ret=1
@@ -371,36 +371,51 @@ END
 echo_i "waiting for change to take effect"
 sleep 3
 
-echo_i "checking that expired RRSIGs from missing key are not deleted ($n)"
+missing=$(keyfile_to_key_id "$(cat noksk-ksk.key)")
+echo_i "checking that expired RRSIGs from missing KSK $missing are not deleted ($n)"
+ret=0
+$JOURNALPRINT ns3/noksk.example.db.jnl | \
+   awk '{if ($1 == "del" && $5 == "RRSIG" && $12 == id) {error=1}} END {exit error}' id=$missing || ret=1
+n=`expr $n + 1`
+if [ $ret != 0 ]; then echo_i "failed"; fi
+status=`expr $status + $ret`
+
+missing=$(keyfile_to_key_id "$(cat nozsk-zsk.key)")
+ksk=$(keyfile_to_key_id "$(cat nozsk-ksk.key)")
+echo_i "checking that expired RRSIGs from missing ZSK $missing are replaced ($n)"
 ret=0
-missing=$(keyfile_to_key_id "$(cat missingzsk.key)")
 $JOURNALPRINT ns3/nozsk.example.db.jnl | \
-   awk '{if ($1 == "del" && $5 == "RRSIG" && $12 == id) {exit 1}} END {exit 0}' id=$missing || ret=1
+   awk '{if ($1 == "del" && $5 == "RRSIG" && $12 == id) {ok=1}} END {exit ok?0:1}' id=$missing || ret=1
+$JOURNALPRINT ns3/nozsk.example.db.jnl | \
+   awk '{if ($1 == "add" && $5 == "RRSIG" && $12 == id) {ok=1}} END {exit ok?0:1}' id=$ksk || ret=1
 n=`expr $n + 1`
 if [ $ret != 0 ]; then echo_i "failed"; fi
 status=`expr $status + $ret`
 
-echo_i "checking that expired RRSIGs from inactive key are not deleted ($n)"
+inactive=$(keyfile_to_key_id "$(cat inaczsk-zsk.key)")
+ksk=$(keyfile_to_key_id "$(cat inaczsk-ksk.key)")
+echo_i "checking that expired RRSIGs from inactive ZSK $inactive are replaced ($n)"
 ret=0
-inactive=$(keyfile_to_key_id "$(cat inactivezsk.key)")
 $JOURNALPRINT ns3/inaczsk.example.db.jnl | \
-   awk '{if ($1 == "del" && $5 == "RRSIG" && $12 == id) {exit 1}} END {exit 0}' id=$inactive || ret=1
+   awk '{if ($1 == "del" && $5 == "RRSIG" && $12 == id) {ok=1}} END {exit ok?0:1}' id=$inactive || ret=1
+$JOURNALPRINT ns3/inaczsk.example.db.jnl | \
+   awk '{if ($1 == "add" && $5 == "RRSIG" && $12 == id) {ok=1}} END {exit ok?0:1}' id=$ksk || ret=1
 n=`expr $n + 1`
 if [ $ret != 0 ]; then echo_i "failed"; fi
 status=`expr $status + $ret`
 
-echo_i "checking that non-replaceable RRSIGs are logged only once (missing private key) ($n)"
+echo_i "checking that replaced RRSIGs are not logged (missing ZSK private key) ($n)"
 ret=0
 loglines=`grep "Key nozsk.example/NSEC3RSASHA1/$missing .* retaining signatures" ns3/named.run | wc -l`
-[ "$loglines" -eq 1 ] || ret=1
+[ "$loglines" -eq 0 ] || ret=1
 n=`expr $n + 1`
 if [ $ret != 0 ]; then echo_i "failed"; fi
 status=`expr $status + $ret`
 
-echo_i "checking that non-replaceable RRSIGs are logged only once (inactive private key) ($n)"
+echo_i "checking that replaced RRSIGs are not logged (inactive ZSK private key) ($n)"
 ret=0
 loglines=`grep "Key inaczsk.example/NSEC3RSASHA1/$inactive .* retaining signatures" ns3/named.run | wc -l`
-[ "$loglines" -eq 1 ] || ret=1
+[ "$loglines" -eq 0 ] || ret=1
 n=`expr $n + 1`
 if [ $ret != 0 ]; then echo_i "failed"; fi
 status=`expr $status + $ret`