diff --git a/src/QueryBuilder.php b/src/QueryBuilder.php
index 4baa70a..d2d2831 100644
--- a/src/QueryBuilder.php
+++ b/src/QueryBuilder.php
@@ -86,7 +86,7 @@ public function whereIsRoot()
      */
     public function whereAncestorOf($id, $andSelf = false, $boolean = 'and')
     {
-        $keyName = $this->model->getKeyName();
+        $keyName = $this->model->getTable() . '.' . $this->model->getKeyName();
 
         if (NestedSet::isNode($id)) {
             $value = '?';
@@ -100,7 +100,7 @@ public function whereAncestorOf($id, $andSelf = false, $boolean = 'and')
                 ->toBase()
                 ->select("_.".$this->model->getRgtName())
                 ->from($this->model->getTable().' as _')
-                ->where($keyName, '=', $id)
+                ->where($this->model->getKeyName(), '=', $id)
                 ->limit(1);
 
             $this->query->mergeBindings($valueQuery);
@@ -108,13 +108,13 @@ public function whereAncestorOf($id, $andSelf = false, $boolean = 'and')
             $value = '('.$valueQuery->toSql().')';
         }
 
-        $this->query->whereNested(function ($inner) use ($value, $andSelf, $id) {
+        $this->query->whereNested(function ($inner) use ($value, $andSelf, $id, $keyName) {
             list($lft, $rgt) = $this->wrappedColumns();
 
             $inner->whereRaw("{$value} between {$lft} and {$rgt}");
 
             if ( ! $andSelf) {
-                $inner->where($this->model->getKeyName(), '<>', $id);
+                $inner->where($keyName, '<>', $id);
             }
         }, $boolean);