diff --git a/C4/Serials.pm b/C4/Serials.pm
index 0e9d0341da..0260673c0b 100644
--- a/C4/Serials.pm
+++ b/C4/Serials.pm
@@ -1217,7 +1217,7 @@ sub _handle_seqno {
 
     my ( $seq, $list, $op ) = @_;    # op = ADD | REMOVE | CHECK (default: ADD)
     my $seq_r = $seq;
-    $seq_r =~ s/([()])/\\$1/g;       # Adjust disturbing parentheses for regex, maybe extend in future
+    $seq_r =~ s/([(){}])/\\$1/g;     # Adjust disturbing parentheses for regex, maybe extend in future
 
     if ( !$op or $op eq 'ADD' ) {
         $list .= "; $seq" if $list !~ /(^|;)\s*$seq_r(?=;|$)/;