diff --git a/utils/Makefile.am b/utils/Makefile.am
index 306d993..f1bbfc5 100644
--- a/utils/Makefile.am
+++ b/utils/Makefile.am
@@ -1,7 +1,8 @@
 # -*- Makefile -*-
 
 AM_CFLAGS = ${regular_CFLAGS}
-AM_CPPFLAGS = ${regular_CPPFLAGS} -I${top_builddir}/include -I${top_srcdir}/include
+AM_CPPFLAGS = ${regular_CPPFLAGS} -I${top_builddir}/include \
+              -I${top_srcdir}/include ${libnfnetlink_CFLAGS}
 
 sbin_PROGRAMS = nfnl_osf
 pkgdata_DATA = pf.os