diff --git a/dhcp.changes b/dhcp.changes
index 65db6ae..b922ee8 100644
--- a/dhcp.changes
+++ b/dhcp.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Jul 13 12:27:59 UTC 2017 - bwiedemann@suse.com
+
+- use .gz year instead of current one to make build reproducible
+
 -------------------------------------------------------------------
 Thu Jul  6 16:17:18 CEST 2017 - ndas@suse.de
 
diff --git a/dhcp.spec b/dhcp.spec
index 95a89c4..aa5d269 100644
--- a/dhcp.spec
+++ b/dhcp.spec
@@ -270,6 +270,9 @@ bind_dir=$(ls -1d bind-*)
 for i in /usr/share/automake-*/config.{sub,guess} ; do
 	install -v -m755 $i $bind_dir/
 done
+# use the year from source gzip header instead of current one to make reproducible rpms
+year=$(perl -e 'sysread(STDIN, $h, 8); print (1900+(gmtime(unpack("l",substr($h,4))))[5])' < bind.tar.gz)
+sed -i "s/stdout, copyright, year/stdout, copyright, \"-$year\"/" $bind_dir/lib/dns/gen.c
 popd
 ##