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-rw-r--r--lib/PublicInbox/Search.pm6
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index a1bae419..8c72fa17 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -16,7 +16,7 @@ use constant YYYYMMDD => 4; # for searching in the WWW UI
 
 use Search::Xapian qw/:standard/;
 use PublicInbox::SearchMsg;
-use Email::MIME;
+use PublicInbox::MIME;
 use PublicInbox::MID qw/mid_clean id_compress/;
 
 # This is English-only, everything else is non-standard and may be confused as
@@ -39,7 +39,9 @@ use constant {
         # 10 - optimize doc for NNTP overviews
         # 11 - merge threads when vivifying ghosts
         # 12 - change YYYYMMDD value column to numeric
-        SCHEMA_VERSION => 12,
+        # 13 - fix threading for empty References/In-Reply-To
+        #      (commit 83425ef12e4b65cdcecd11ddcb38175d4a91d5a0)
+        SCHEMA_VERSION => 13,
 
         # n.b. FLAG_PURE_NOT is expensive not suitable for a public website
         # as it could become a denial-of-service vector