diff --git a/contrib/check5011.pl b/contrib/check5011.pl
index 70d873a087..5306e8bfb2 100644
--- a/contrib/check5011.pl
+++ b/contrib/check5011.pl
@@ -9,7 +9,7 @@ my $now = strftime "%Y%m%d%H%M%S", gmtime;
 sub ext8601 ($) {
 	my $d = shift;
 	$d =~ s{(....)(..)(..)(..)(..)(..)}
-	       {$1-$2-$3.$4:$5:$6};
+	       {$1-$2-$3.$4:$5:$6+0000};
 	return $d;
 }