diff --git a/cddl/usr.sbin/zfsd/Makefile.common b/cddl/usr.sbin/zfsd/Makefile.common
index 6c71bdf..6b71908 100644
--- a/cddl/usr.sbin/zfsd/Makefile.common
+++ b/cddl/usr.sbin/zfsd/Makefile.common
@@ -31,6 +31,7 @@ INCFLAGS+= -I${SRCDIR}/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
 INCFLAGS+= -I${SRCDIR}/sys/cddl/contrib/opensolaris/uts/common/sys
 
 CFLAGS= -g -DNEED_SOLARIS_BOOLEAN ${INCFLAGS}
+CXXFLAGS= -g -DNEED_SOLARIS_BOOLEAN ${INCFLAGS}
 
 DPADD=  ${LIBDEVDCTL} ${LIBZFS} ${LIBZFS_CORE} ${LIBUTIL} ${LIBGEOM} \
 	${LIBBSDXML} ${LIBSBUF} ${LIBNVPAIR} ${LIBUUTIL}