1 files changed, 4 insertions, 1 deletions
diff --git a/lib/PublicInbox/Filter/RubyLang.pm b/lib/PublicInbox/Filter/RubyLang.pm
index ec4bc320..5240e8df 100644
--- a/lib/PublicInbox/Filter/RubyLang.pm
+++ b/lib/PublicInbox/Filter/RubyLang.pm
@@ -15,10 +15,13 @@ sub new {
          my ($class, %opts) = @_;
          my $altid = delete $opts{-altid};
          my $self = $class->SUPER::new(%opts);
+        my $ibx = $self->{-inbox};
          # altid = serial:ruby-core:file=msgmap.sqlite3
+        if (!$altid && $ibx && $ibx->{altid}) {
+                $altid ||= $ibx->{altid}->[0];
+        }
          if ($altid) {
                  require PublicInbox::MID; # mid_clean
-                my $ibx = $self->{-inbox};
                  require PublicInbox::AltId;
                  $self->{-altid} = PublicInbox::AltId->new($ibx, $altid, 1);
          }