diff --git a/sys/netinet6/in6_pcb.c b/sys/netinet6/in6_pcb.c
index 0f18bd1921ee..f1b92a3f76b6 100644
--- a/sys/netinet6/in6_pcb.c
+++ b/sys/netinet6/in6_pcb.c
@@ -622,6 +622,7 @@ in6_pcbdetach(inp)
 	ip_freemoptions(inp->inp_moptions);
 
 	inp->inp_vflag = 0;
+	INP_LOCK_DESTROY(inp);
 	uma_zfree(ipi->ipi_zone, inp);
 }