diff --git a/web/includes/actions/eventdetail.php b/web/includes/actions/eventdetail.php
index c0507776f..561c2cb78 100644
--- a/web/includes/actions/eventdetail.php
+++ b/web/includes/actions/eventdetail.php
@@ -31,7 +31,7 @@ if ( !canEdit('Events') ) {
 
 if ( $action == 'eventdetail' ) {
   $dbConn->beginTransaction();
-  foreach ( getAffectedIds('markEid') as $markEid ) {
+  foreach ( $_REQUEST['markEids'] as $markEid ) {
     dbQuery('UPDATE Events SET Cause=?, Notes=? WHERE Id=?',
       array(
         $_REQUEST['newEvent']['Cause'],
diff --git a/web/skins/classic/views/eventdetail.php b/web/skins/classic/views/eventdetail.php
index 1afe23d9f..388c7cfb2 100644
--- a/web/skins/classic/views/eventdetail.php
+++ b/web/skins/classic/views/eventdetail.php
@@ -33,7 +33,7 @@ if ( isset($_REQUEST['eid']) ) {
   $sqlValues = array();
   foreach ( $_REQUEST['eids'] as $eid ) {
     $sqlWhere[] = 'E.Id = ?';
-    $sqlValues[] = $eid;
+    $sqlValues[] = validInt($eid);
   }
   unset($eid);
   $sql .= join(' OR ', $sqlWhere);
@@ -80,14 +80,14 @@ if ( $mode == 'single' ) {
 <?php
 if ( $mode == 'single' ) {
 ?>
-        <input type="hidden" name="eid" value="<?php echo $eid ?>"/>
+        <input type="hidden" name="markEids[]" value="<?php echo validInt($eid) ?>"/>
 <?php
 } else if ( $mode = 'multi' ) {
 ?>
 <?php
     foreach ( $_REQUEST['eids'] as $eid ) {
 ?>
-        <input type="hidden" name="markEids[]" value="<?php echo validHtmlStr($eid) ?>"/>
+        <input type="hidden" name="markEids[]" value="<?php echo validInt($eid) ?>"/>
 <?php
     }
 }