diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/virtualshelves/addbybiblionumber.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/virtualshelves/addbybiblionumber.tt
index 85ef902adc..1f2023c4ec 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/virtualshelves/addbybiblionumber.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/virtualshelves/addbybiblionumber.tt
@@ -116,6 +116,7 @@
         <nav class="navbar navbar-default navbar-fixed-bottom">
             <div class="container-fluid">
                 <fieldset class="action">
+                    <input type="hidden" name="op" value="cud-add" />
                     <input type="submit" class="btn btn-primary" value="Save" />
                     <button class="btn btn-default close_window">Cancel</button>
                 </fieldset>
diff --git a/virtualshelves/addbybiblionumber.pl b/virtualshelves/addbybiblionumber.pl
index 59a33c2387..69483d5dc1 100755
--- a/virtualshelves/addbybiblionumber.pl
+++ b/virtualshelves/addbybiblionumber.pl
@@ -66,6 +66,7 @@ use Koha::Biblios;
 use Koha::Virtualshelves;
 
 my $query           = CGI->new;
+my $op              = $query->param('op') // q{};
 my $shelfnumber     = $query->param('shelfnumber');
 my $newvirtualshelf = $query->param('newvirtualshelf');
 my $newshelf        = $query->param('newshelf');
@@ -90,7 +91,9 @@ my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
     }
 );
 
-if ($newvirtualshelf) {
+if ( $op && $op !~ /^cud-/ ) {
+    $authorized = 0;
+} elsif ($newvirtualshelf) {
     my $shelf = eval {
         Koha::Virtualshelf->new(
             {