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-rw-r--r--lib/PublicInbox/Lock.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/Lock.pm b/lib/PublicInbox/Lock.pm
index 76c3ffb2..0ee2a8bd 100644
--- a/lib/PublicInbox/Lock.pm
+++ b/lib/PublicInbox/Lock.pm
@@ -16,7 +16,7 @@ sub lock_acquire {
         my $lock_path = $self->{lock_path};
         croak 'already locked '.($lock_path // '(undef)') if $self->{lockfh};
         return unless defined($lock_path);
-        sysopen(my $lockfh, $lock_path, O_WRONLY|O_CREAT) or
+        sysopen(my $lockfh, $lock_path, O_RDWR|O_CREAT) or
                 croak "failed to open $lock_path: $!\n";
         flock($lockfh, LOCK_EX) or croak "lock $lock_path failed: $!\n";
         $self->{lockfh} = $lockfh;