diff --git a/bin/tests/system/kasp.sh b/bin/tests/system/kasp.sh
index f41911a68e..785b69c770 100644
--- a/bin/tests/system/kasp.sh
+++ b/bin/tests/system/kasp.sh
@@ -80,6 +80,10 @@ key_set() {
 	eval "$(key_key "$1" "$2")='$3'"
 }
 
+key_stat() {
+	$PERL -e 'print((stat @ARGV[0])[9] . "\n");' "$1"
+}
+
 # Save certain values in the KEY array.
 key_save()
 {
@@ -90,9 +94,9 @@ key_save()
 	# Save creation date.
 	key_set "$1" CREATED "${KEY_CREATED}"
 	# Save key change time.
-	key_set "$1" PRIVKEY_STAT $(stat -c '%Z' "${BASE_FILE}.private")
-	key_set "$1" PUBKEY_STAT $(stat -c '%Z' "${BASE_FILE}.key")
-	key_set "$1" STATE_STAT $(stat -c '%Z' "${BASE_FILE}.state")
+	key_set "$1" PRIVKEY_STAT $(key_stat "${BASE_FILE}.private")
+	key_set "$1" PUBKEY_STAT $(key_stat "${BASE_FILE}.key")
+	key_set "$1" STATE_STAT $(key_stat "${BASE_FILE}.state")
 }
 
 # Clear key state.
diff --git a/bin/tests/system/kasp/tests.sh b/bin/tests/system/kasp/tests.sh
index 0607b8e941..650c961f4e 100644
--- a/bin/tests/system/kasp/tests.sh
+++ b/bin/tests/system/kasp/tests.sh
@@ -306,9 +306,9 @@ state_stat=$(key_get KEY1 STATE_STAT)
 nextpart $DIR/named.run > /dev/null
 rndccmd 10.53.0.3 loadkeys "$ZONE" > /dev/null || log_error "rndc loadkeys zone ${ZONE} failed"
 wait_for_log 3 "keymgr: $ZONE done" $DIR/named.run
-privkey_stat2=$(stat -c '%Z' "${basefile}.private")
-pubkey_stat2=$(stat -c '%Z' "${basefile}.key")
-state_stat2=$(stat -c '%Z' "${basefile}.state")
+privkey_stat2=$(key_stat "${basefile}.private")
+pubkey_stat2=$(key_stat "${basefile}.key")
+state_stat2=$(key_stat "${basefile}.state")
 test "$privkey_stat" = "$privkey_stat2" || log_error "wrong private key file stat (expected $privkey_stat got $privkey_stat2)"
 test "$pubkey_stat" = "$pubkey_stat2" || log_error "wrong public key file stat (expected $pubkey_stat got $pubkey_stat2)"
 test "$state_stat" = "$state_stat2" || log_error "wrong state file stat (expected $state_stat got $state_stat2)"
@@ -322,9 +322,9 @@ ret=0
 nextpart $DIR/named.run > /dev/null
 rndccmd 10.53.0.3 loadkeys "$ZONE" > /dev/null || log_error "rndc loadkeys zone ${ZONE} failed"
 wait_for_log 3 "keymgr: done" $DIR/named.run
-privkey_stat2=$(stat -c '%Z' "${basefile}.private")
-pubkey_stat2=$(stat -c '%Z' "${basefile}.key")
-state_stat2=$(stat -c '%Z' "${basefile}.state")
+privkey_stat2=$(key_stat "${basefile}.private")
+pubkey_stat2=$(key_stat "${basefile}.key")
+state_stat2=$(key_stat "${basefile}.state")
 test "$privkey_stat" = "$privkey_stat2" || log_error "wrong private key file stat (expected $privkey_stat got $privkey_stat2)"
 test "$pubkey_stat" = "$pubkey_stat2" || log_error "wrong public key file stat (expected $pubkey_stat got $pubkey_stat2)"
 test "$state_stat" = "$state_stat2" || log_error "wrong state file stat (expected $state_stat got $state_stat2)"