diff --git a/postfix-install b/postfix-install
index 6b2a261..3edd2c6 100644
--- a/postfix-install
+++ b/postfix-install
@@ -40,6 +40,10 @@
 #	is installed from a pre-built package or from source code.
 #
 #	Arguments
+# .IP -keep-build-mtime
+#      When installing files preserve new file's mtime timestamps.
+#      Otherwise, mtimes will be set to the time that postfix-install
+#      is run.
 # .IP -non-interactive
 #	Do not ask the user for parameter settings. Installation parameters
 #	are specified via one of the non-interactive methods described
@@ -179,6 +183,7 @@ BACKUP_IFS="$IFS"
 LC_ALL=C; export LC_ALL
 
 USAGE="Usage: $0 [name=value] [option]
+    -keep-build-mtime         Preserve build-time file mtime timestamps.
     -non-interactive        Do not ask for installation parameters.
     -package                Build a ready-to-install package.
     name=value              Specify an installation parameter".
@@ -193,6 +198,8 @@ do
       *=*) IFS= eval $arg; IFS="$BACKUP_IFS";;
 -non-int*) non_interactive=1;;
  -package) need_install_root=install_root;;
+-keep-build-mtime)
+           keep_build_mtime=1;;
         *) echo "$0: Error: $USAGE" 1>&2; exit 1;;
     esac
     shift
@@ -245,6 +252,7 @@ compare_or_replace() {
 	echo Updating $dst...
 	rm -f $tempdir/junk || exit 1
 	cp $src $tempdir/junk || exit 1
+	test -z "$keep_build_mtime" || touch -r $src $tempdir/junk || exit 1
 	mv -f $tempdir/junk $dst || exit 1
 	test -z "$owner" || chown $owner $dst || exit 1
 	test -z "$group" || chgrp $group $dst || exit 1