diff --git a/Makefile.iptrules.in b/Makefile.iptrules.in
index c1bb116..4f58d8a 100644
--- a/Makefile.iptrules.in
+++ b/Makefile.iptrules.in
@@ -1,6 +1,8 @@
 # -*- Makefile -*-
 # MANUAL
 
+abs_top_srcdir  = @abs_top_srcdir@
+
 prefix          = @prefix@
 exec_prefix     = @exec_prefix@
 libexecdir      = @libexecdir@
@@ -13,7 +15,7 @@ CFLAGS          = @CFLAGS@
 regular_CFLAGS  = @regular_CFLAGS@
 libxtables_CFLAGS = @libxtables_CFLAGS@
 libxtables_LIBS   = @libxtables_LIBS@
-AM_CFLAGS         = ${regular_CFLAGS} ${libxtables_CFLAGS}
+AM_CFLAGS         = ${regular_CFLAGS} ${libxtables_CFLAGS} -I${abs_top_srcdir}/extensions
 AM_DEPFLAGS     = -Wp,-MMD,$(@D)/.$(@F).d,-MT,$@
 
 AM_DEFAULT_VERBOSITY = 0
diff --git a/extensions/ACCOUNT/libxt_ACCOUNT.c b/extensions/ACCOUNT/libxt_ACCOUNT.c
index 670fefa..b5aad44 100644
--- a/extensions/ACCOUNT/libxt_ACCOUNT.c
+++ b/extensions/ACCOUNT/libxt_ACCOUNT.c
@@ -12,6 +12,7 @@
 #include <stddef.h>
 #include <xtables.h>
 #include "xt_ACCOUNT.h"
+#include "compat_user.h"
 
 static struct option account_tg_opts[] = {
 	{.name = "addr",  .has_arg = true, .val = 'a'},
diff --git a/extensions/pknock/libxt_pknock.c b/extensions/pknock/libxt_pknock.c
index c423200..fb6d433 100644
--- a/extensions/pknock/libxt_pknock.c
+++ b/extensions/pknock/libxt_pknock.c
@@ -16,6 +16,7 @@
 #include <linux/netfilter.h>
 #include <linux/netfilter_ipv4/ip_tables.h>
 #include "xt_pknock.h"
+#include "compat_user.h"
 
 static const struct option pknock_mt_opts[] = {
 	/* .name, .has_arg, .flag, .val */