diff --git a/build-aux/Makefile.am b/build-aux/Makefile.am
index 60d3d13e..7bed5b7c 100644
--- a/build-aux/Makefile.am
+++ b/build-aux/Makefile.am
@@ -1,21 +1,21 @@
 #
 # Copyright (C) 2018 Red Hat, Inc.  All rights reserved.
 #
 # Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
 #
 # This software licensed under GPL-2.0+, LGPL-2.0+
 #
 
 MAINTAINERCLEANFILES	= Makefile.in
 
 include $(top_srcdir)/build-aux/check.mk
 
 EXTRA_DIST	= check.mk gitlog-to-changelog git-version-gen \
 		  knet_valgrind_helgrind.supp knet_valgrind_memcheck.supp \
 		  release.mk update-copyright.sh
 
 noinst_PROGRAMS	= doxyxml
 
 doxyxml_SOURCES = doxyxml.c
-doxyxml_CFLAGS = $(libqb_CFLAGS) $(libxml_CFLAGS)
+doxyxml_CFLAGS = $(AM_CFLAGS) $(libqb_CFLAGS) $(libxml_CFLAGS)
 doxyxml_LDADD = $(libqb_LIBS) $(libxml_LIBS)