diff --git a/tests/sys/netpfil/pf/fragmentation.sh b/tests/sys/netpfil/pf/fragmentation.sh
--- a/tests/sys/netpfil/pf/fragmentation.sh
+++ b/tests/sys/netpfil/pf/fragmentation.sh
@@ -103,6 +103,10 @@
 	jexec singsing ifconfig ${epair_link}b inet6 -ifdisabled
 	ifconfig ${epair_send}a inet6 -ifdisabled
 
+	ifconfig ${epair_send}a
+	jexec alcatraz ifconfig ${epair_send}b
+	lladdr=$(jexec alcatraz ifconfig ${epair_send}b | awk '/ scopeid / { print($2); }' | cut -f 1 -d %)
+
 	jexec alcatraz pfctl -e
 	pft_set_rules alcatraz \
 		"scrub fragment reassemble" \
@@ -120,6 +124,12 @@
 	atf_check -s exit:0 -o ignore\
 		ping -6 -c 1 -b 70000 -s 65000 2001:db8:42::2
 
+	# Force an NDP lookup
+	ping -6 -c 1 ${lladdr}%${epair_send}a
+
+	atf_check -s exit:0 -o ignore\
+		ping -6 -c 1 -b 70000 -s 65000 ${lladdr}%${epair_send}a
+
 	# Forwarding test
 	atf_check -s exit:0 -o ignore \
 		ping -6 -c 1 2001:db8:43::3