diff --git a/cataloguing/value_builder/unimarc_field_100.pl b/cataloguing/value_builder/unimarc_field_100.pl
index df4c970291..b3725ba6c6 100755
--- a/cataloguing/value_builder/unimarc_field_100.pl
+++ b/cataloguing/value_builder/unimarc_field_100.pl
@@ -33,7 +33,9 @@ sub plugin_javascript {
     my ( $dbh, $record, $tagslib, $field_number ) = @_;
     my $res           = "
         <script>
-            function Clic$field_number(i) {
+            function Clic$field_number(event) {
+                event.preventDefault();
+                const i = event.data.id;
                 var defaultvalue;
                 try {
                     defaultvalue = document.getElementById(i).value;