diff --git a/autogen.sh b/autogen.sh
index 387bea731..850bcbc17 100644
--- a/autogen.sh
+++ b/autogen.sh
@@ -4,6 +4,7 @@ set -e
 
 autoconf
 autoheader
+echo timestamp > stamp-h.in
 for rmk in conf/*.rmk; do
   ruby genmk.rb < $rmk > `echo $rmk | sed 's/\.rmk$/.mk/'`
 done