diff --git a/koha-tmpl/intranet-tmpl/prog/en/includes/calendar.inc b/koha-tmpl/intranet-tmpl/prog/en/includes/calendar.inc
index 6dc58c4059..8d60a21370 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/includes/calendar.inc
+++ b/koha-tmpl/intranet-tmpl/prog/en/includes/calendar.inc
@@ -97,11 +97,13 @@
                         dateMode: altinput_dateformat,
                         timeMode: 'HH:MM',
                         dateSeparator: delimiter,
+                        overwiteMode: 'replace',
                     });
                 } else {
                     maskitoOptions = maskitoDateOptionsGenerator({
                         mode: altinput_dateformat,
                         separator: delimiter,
+                        overwiteMode: 'replace',
                     });
                 }
             }