diff --git a/koha-tmpl/intranet-tmpl/prog/en/includes/cat-toolbar.inc b/koha-tmpl/intranet-tmpl/prog/en/includes/cat-toolbar.inc
index 5371398a2b..24d389494a 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/includes/cat-toolbar.inc
+++ b/koha-tmpl/intranet-tmpl/prog/en/includes/cat-toolbar.inc
@@ -238,7 +238,7 @@ function confirm_items_deletion() {
 	[% IF ( CAN_user_reserveforothers ) %]
     [% UNLESS ( norequests ) %]<li><a id="placehold" href="/cgi-bin/koha/reserve/request.pl?biblionumber=[% biblionumber %]">Place hold</a></li>[% END %]
 	[% END %]
-    [% IF ( CAN_user_editcatalogue_edit_catalogue ) %]<li id="z3950searchc"><input type="button" id="z3950search" value="Z39.50 search" onclick="PopupZ3950(); return false;" /></li>[% END %]
+	[% IF ( CAN_user_editcatalogue_edit_catalogue ) %]<li id="z3950searchc"><input type="button" id="z3950search" value="Z39.50 Search" onclick="if (confirm(_('Please note that this Z39.50 search could replace the current record.'))){ PopupZ3950(); } return false;" /></li>[% END %]
     </ul>
 </form>
 </div>
diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/cataloguing/addbiblio.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/cataloguing/addbiblio.tt
index f934fbe613..ee8e9fae43 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/cataloguing/addbiblio.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/cataloguing/addbiblio.tt
@@ -767,7 +767,7 @@ function unHideSubfield(index,labelindex) { // FIXME :: is it used ?
             type: "button",
             label: _("Z39.50 Search"),
             container: "z3950searchc",
-			onclick: {fn:function(){PopupZ3950()}}
+            onclick: {fn:function(){if (confirm(_("Please note that this Z39.50 search could replace the current record."))) PopupZ3950()}}
         });
 	}