diff --git a/web/includes/Group.php b/web/includes/Group.php
index 543665655..ee86a320c 100644
--- a/web/includes/Group.php
+++ b/web/includes/Group.php
@@ -249,7 +249,7 @@ $group_options[$Group->Id()] = str_repeat( ' ', $depth ) .  $Group->Name();
 
         $MonitorIds = array_merge( $MonitorIds, dbFetchAll( 'SELECT MonitorId FROM Groups_Monitors WHERE GroupId IN (SELECT Id FROM Groups WHERE ParentId = ?)', 'MonitorId', array($group_id) ) );
       }
-      $groupSql = " find_in_set( Id, '".implode( ',', $MonitorIds )."' )";
+      $groupSql = " find_in_set( M.Id, '".implode( ',', $MonitorIds )."' )";
     }
     return $groupSql;
   } # end public static function get_group_sql( $group_id )
diff --git a/web/skins/classic/views/_monitor_filters.php b/web/skins/classic/views/_monitor_filters.php
index 7633200ea..9d3a12ad6 100644
--- a/web/skins/classic/views/_monitor_filters.php
+++ b/web/skins/classic/views/_monitor_filters.php
@@ -85,7 +85,7 @@ if ( ! is_array( $selected_monitor_ids ) ) {
   } # end foreach filter
   if ( ! empty( $user['MonitorIds'] ) ) {
     $ids = explode(',', $user['MonitorIds'] );
-    $conditions[] = 'Id IN ('.implode(',',array_map( function(){return '?';}, $ids) ).')';
+    $conditions[] = 'M.Id IN ('.implode(',',array_map( function(){return '?';}, $ids) ).')';
     $values += $ids;
   }