diff --git a/application/Preorder/PreorderModel.php b/application/Preorder/PreorderModel.php
index e84b60bcc..c7c59956e 100644
--- a/application/Preorder/PreorderModel.php
+++ b/application/Preorder/PreorderModel.php
@@ -384,24 +384,24 @@ class PreorderModel {
     if(array_key_exists("adb_hausnummer_id", $filter)) {
       $adb_hausnummer_id = $filter['adb_hausnummer_id'];
       if(is_numeric($adb_hausnummer_id)) {
-        $where .= " AND adb_hausnummer_id=$adb_hausnummer_id";
+        $where .= " AND tt_preorder.adb_hausnummer_id=$adb_hausnummer_id";
       } elseif(is_array($adb_hausnummer_id)) {
-        $where .= " AND adb_hausnummer_id IN (".implode(",",$adb_hausnummer_id).")";
+        $where .= " AND tt_preorder.adb_hausnummer_id IN (".implode(",",$adb_hausnummer_id).")";
       } elseif($adb_hausnummer_id === null) {
-        $where .= " AND adb_hausnummer_id IS NULL";
+        $where .= " AND tt_preorder.adb_hausnummer_id IS NULL";
       }
     }
     
     if(array_key_exists("adb_wohneinheit_id", $filter)) {
       $adb_wohneinheit_id = $filter['adb_wohneinheit_id'];
       if(is_numeric($adb_wohneinheit_id)) {
-        $where .= " AND adb_wohneinheit_id=$adb_wohneinheit_id";
+        $where .= " AND tt_preorder.adb_wohneinheit_id=$adb_wohneinheit_id";
       } elseif(is_array($adb_wohneinheit_id)) {
-        $where .= " AND adb_wohneinheit_id IN (".implode(",",$adb_wohneinheit_id).")";
+        $where .= " AND tt_preorder.adb_wohneinheit_id IN (".implode(",",$adb_wohneinheit_id).")";
       } elseif($adb_wohneinheit_id === null) {
-        $where .= " AND adb_wohneinheit_id IS NULL";
+        $where .= " AND tt_preorder.adb_wohneinheit_id IS NULL";
       } elseif($adb_wohneinheit_id === true) {
-        $where .= " AND adb_wohneinheit_id IS NOT NULL AND adb_wohneinheit_id > 0";
+        $where .= " AND tt_preorder.adb_wohneinheit_id IS NOT NULL AND tt_preorder.adb_wohneinheit_id > 0";
       }
     }