diff --git a/extensions/ACCOUNT/Makefile.am b/extensions/ACCOUNT/Makefile.am
index 2e56bf0..08f3bfe 100644
--- a/extensions/ACCOUNT/Makefile.am
+++ b/extensions/ACCOUNT/Makefile.am
@@ -1,5 +1,8 @@
 # -*- Makefile -*-
 
+AM_CPPFLAGS = ${regular_CPPFLAGS} -I${abs_top_srcdir}/extensions
+AM_CFLAGS   = ${regular_CFLAGS}
+
 include ../../Makefile.extra
 
 sbin_PROGRAMS = iptaccount
diff --git a/extensions/pknock/Makefile.am b/extensions/pknock/Makefile.am
index a7273ad..d3a0ab3 100644
--- a/extensions/pknock/Makefile.am
+++ b/extensions/pknock/Makefile.am
@@ -1,6 +1,6 @@
 # -*- Makefile -*-
 
-AM_CPPFLAGS = ${regular_CPPFLAGS}
+AM_CPPFLAGS = ${regular_CPPFLAGS} -I${abs_top_srcdir}/extensions
 AM_CFLAGS   = ${regular_CFLAGS}
 
 include ../../Makefile.extra