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-rw-r--r--lib/PublicInbox/Msgmap.pm1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/PublicInbox/Msgmap.pm b/lib/PublicInbox/Msgmap.pm
index 8a34e7e0..6e9f2743 100644
--- a/lib/PublicInbox/Msgmap.pm
+++ b/lib/PublicInbox/Msgmap.pm
@@ -19,6 +19,7 @@ sub new {
                 AutoCommit => 1,
                 RaiseError => 1,
                 PrintError => 0,
+                ReadOnly => !$writable,
                 sqlite_use_immediate_transaction => 1,
         });
         $dbh->do('PRAGMA case_sensitive_like = ON');