diff --git a/include/Makefile b/include/Makefile
index 76f521d22227..61435ccd40d0 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -194,6 +194,11 @@ copies:
 	cd ${.CURDIR}/../sys/contrib/ipfilter/netinet; \
 	${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 *.h \
 	    ${DESTDIR}${INCLUDEDIR}/netinet
+.endif
+.if ${MK_PF} != "no"
+	cd ${.CURDIR}/../sys/netpfil/pf; \
+	${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 *.h \
+	    ${DESTDIR}${INCLUDEDIR}/netpfil/pf
 .endif
 	cd ${.CURDIR}/../sys/crypto; \
 	${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 rijndael/rijndael.h \