diff --git a/src/Relationships/HasOne.php b/src/Relationships/HasOne.php
index d23fa380..5c68b6a4 100644
--- a/src/Relationships/HasOne.php
+++ b/src/Relationships/HasOne.php
@@ -249,16 +249,6 @@ protected function isChanged($newValue)
 	}
 
 
-	protected function getRelationshipMapper()
-	{
-		if (!$this->relationshipMapper) {
-			$this->relationshipMapper = $this->createCollection()->getRelationshipMapper();
-		}
-
-		return $this->relationshipMapper;
-	}
-
-
 	abstract protected function modify();