diff --git a/root/usr/share/qpsmtpd/plugins/logging/log2sql b/root/usr/share/qpsmtpd/plugins/logging/log2sql
index 124616e..24d1241 100644
--- a/root/usr/share/qpsmtpd/plugins/logging/log2sql
+++ b/root/usr/share/qpsmtpd/plugins/logging/log2sql
@@ -136,8 +136,13 @@ my($header) = $transaction->header();
 #'touch' this message :-))
 $header->add("X-Sql-Log-ID",$mail_id);
 
+my $subject = scalar $header->get("Subject");
+chomp($subject);
+# Only keep the first 255 chars to be sure it can be inserted in the table
+$subject= substr $subject, 0, 254;
+
 my($statement) = "UPDATE ".$mail_table." SET subject=".
-                 $dbh->quote(scalar $header->get("Subject")).
+                 $dbh->quote($subject).
                  ",header_size=".$dbh->quote(length($header->as_string())).
                  ",body_size=".$dbh->quote($transaction->body_size()).
                  " WHERE mail_id=".$mail_id;