diff --git a/autogen.changes b/autogen.changes
index c01aadb..bd1fe19 100644
--- a/autogen.changes
+++ b/autogen.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Jun 10 11:53:58 UTC 2020 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Set MAN_PAGE_DATE to normalize man page date (boo#1047218)
+
 -------------------------------------------------------------------
 Mon May 11 16:28:29 UTC 2020 - Andreas Schwab <schwab@suse.de>
 
diff --git a/autogen.spec b/autogen.spec
index f024c9d..1ed6a8c 100644
--- a/autogen.spec
+++ b/autogen.spec
@@ -102,6 +102,7 @@ touch aclocal.m4 configure Makefile.in config-h.in
 make %{?_smp_mflags}
 
 %install
+export MAN_PAGE_DATE=$(date -u -d @${SOURCE_DATE_EPOCH:-$(date +%s)} -I)
 %make_install
 find %{buildroot} -type f -name "*.la" -delete -print
 %fdupes -s %{buildroot}%{_datadir}