--- a/Makefile.am
+++ b/Makefile.am
@@ -14,7 +14,7 @@
 EXTRA_DIST = autogen.sh ccrtp.spec ccrtp.spec.in COPYING.addendum \
 	ccrtp.list ccrtp.list.in libccrtp1.pc libccrtp1.pc.in autoconf/*
 
-SUBDIRS = src doc demo
+SUBDIRS = demo doc src zrtp
 DIST_SUBDIRS = m4 src phone doc demo w32
 
 pkgconfigdir = $(libdir)/pkgconfig