diff --git a/sys/netpfil/pf/pf_norm.c b/sys/netpfil/pf/pf_norm.c
--- a/sys/netpfil/pf/pf_norm.c
+++ b/sys/netpfil/pf/pf_norm.c
@@ -53,6 +53,7 @@
 #include <netinet/ip.h>
 #include <netinet/ip_var.h>
 #include <netinet6/ip6_var.h>
+#include <netinet6/scope6_var.h>
 #include <netinet/tcp.h>
 #include <netinet/tcp_fsm.h>
 #include <netinet/tcp_seq.h>
@@ -946,6 +947,7 @@
 pf_refragment6(struct ifnet *ifp, struct mbuf **m0, struct m_tag *mtag, int pflags)
 {
 	struct mbuf		*m = *m0, *t;
+	struct ip6_hdr		*hdr;
 	struct pf_fragment_tag	*ftag = (struct pf_fragment_tag *)(mtag + 1);
 	struct pf_pdesc		 pd;
 	uint32_t		 frag_id;
@@ -972,13 +974,17 @@
 		*(mtod(m, char *) + off) = IPPROTO_FRAGMENT;
 		m = *m0;
 	} else {
-		struct ip6_hdr *hdr;
-
 		hdr = mtod(m, struct ip6_hdr *);
 		proto = hdr->ip6_nxt;
 		hdr->ip6_nxt = IPPROTO_FRAGMENT;
 	}
 
+	/* In case of link-local traffic we'll need a scope set. */
+	hdr = mtod(m, struct ip6_hdr *);
+
+	in6_setscope(&hdr->ip6_src, ifp, NULL);
+	in6_setscope(&hdr->ip6_dst, ifp, NULL);
+
 	/* The MTU must be a multiple of 8 bytes, or we risk doing the
 	 * fragmentation wrong. */
 	maxlen = maxlen & ~7;