diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/patron_lists/list.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/patron_lists/list.tt
index 3ca8e7d39d..8e3b25d3b5 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/patron_lists/list.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/patron_lists/list.tt
@@ -146,6 +146,7 @@
                 <div id="patrons_to_add"></div>
 
                 <fieldset class="action">
+                    <input type="hidden" name="op" value="cud-add" />
                     <input type="hidden" name="patron_list_id" value="[% list.patron_list_id | html %]" />
                     <input type="submit" class="btn btn-primary" value="Add patrons" />
                     <a href="lists.pl" class="cancel">Cancel</a>
@@ -216,6 +217,7 @@
             </div> <!-- /.page-section -->
 
             <fieldset class="action">
+                <input type="hidden" name="op" value="cud-delete" />
                 <input type="hidden" name="patron_list_id" value="[% list.patron_list_id | html %]" />
                 <button type="submit" class="btn btn-default btn-sm list-remove"><i class="fa fa-trash-can" aria-hidden="true"></i> Remove selected patrons</button>
                 <button class="btn btn-default btn-sm merge-patrons" type="submit"><i class="fa fa-compress"></i> Merge selected patrons</button>
diff --git a/patron_lists/list.pl b/patron_lists/list.pl
index 45b11a1667..3ecf1a8172 100755
--- a/patron_lists/list.pl
+++ b/patron_lists/list.pl
@@ -31,6 +31,7 @@ use Koha::List::Patron qw(
 use List::MoreUtils qw( uniq );
 
 my $cgi = CGI->new;
+my $op  = $cgi->param('op') // q{};
 
 my ( $template, $logged_in_user, $cookie ) = get_template_and_user(
     {
@@ -49,7 +50,7 @@ my @existing = $list->patron_list_patrons;
 my $patrons_by_id = $cgi->param('patrons_by_id');
 my $id_column = $cgi->param('id_column');
 
-if ( $patrons_by_id ){
+if ( $op eq 'cud-add' && $patrons_by_id ) {
     push my @patrons_list, uniq( split(/\s\n/, $patrons_by_id) );
     my %add_params;
     $add_params{list} = $list;
@@ -71,12 +72,12 @@ if ( $patrons_by_id ){
 }
 
 my @patrons_to_add = $cgi->multi_param('patrons_to_add');
-if (@patrons_to_add) {
+if ( $op eq 'cud-add' && @patrons_to_add) {
     AddPatronsToList( { list => $list, cardnumbers => \@patrons_to_add } );
 }
 
 my @patrons_to_remove = $cgi->multi_param('patrons_to_remove');
-if (@patrons_to_remove) {
+if ( $op eq 'cud-delete' && @patrons_to_remove) {
     DelPatronsFromList( { list => $list, patron_list_patrons => \@patrons_to_remove } );
 }