diff --git a/sys/Makefile b/sys/Makefile
index 46c95d47f736..5b2c198ad085 100644
--- a/sys/Makefile
+++ b/sys/Makefile
@@ -10,7 +10,7 @@ SUBDIR=	boot
 # Directories to include in cscope name file and TAGS.
 CSCOPEDIRS=	boot bsm cam cddl compat conf contrib crypto ddb dev fs gdb \
 		geom gnu isa kern libkern modules net net80211 netatalk \
-		netgraph netinet netinet6 netipsec netipx netnatm \
+		netgraph netinet netinet6 netipsec netipx netnatm netpfil \
 		netsmb nfs nfsclient nfsserver nlm ofed opencrypto \
 		pci rpc security sys ufs vm xdr xen ${CSCOPE_ARCHDIR}
 .if !defined(CSCOPE_ARCHDIR)