diff --git a/cake/libs/model/datasources/dbo_source.php b/cake/libs/model/datasources/dbo_source.php
index <HASH>..<HASH> 100755
--- a/cake/libs/model/datasources/dbo_source.php
+++ b/cake/libs/model/datasources/dbo_source.php
@@ -515,7 +515,7 @@ class DboSource extends DataSource {
  * @return integer Number of rows in resultset
  */
 	function lastNumRows() {
-		return $this->lastAffected($source);
+		return $this->lastAffected();
 	}
 
 /**
Removed the unused var.