diff --git a/src/Traits/EloquentJoinTrait.php b/src/Traits/EloquentJoinTrait.php
index eccc199..63f9fe9 100644
--- a/src/Traits/EloquentJoinTrait.php
+++ b/src/Traits/EloquentJoinTrait.php
@@ -100,7 +100,7 @@ private function performJoin($builder, $relations)
 
             $relatedRelation = $currentModel->$relation();
             $relatedModel = $relatedRelation->getRelated();
-            $relatedPrimaryKey = $currentModel->getKeyName();
+            $relatedPrimaryKey = $relatedModel->getKeyName();
             $relatedTable = $relatedModel->getTable();
 
             $this->validateJoinQuery($relatedModel);