diff --git a/setup/modelfactory.class.inc.php b/setup/modelfactory.class.inc.php
index 069502062..21b49ec58 100644
--- a/setup/modelfactory.class.inc.php
+++ b/setup/modelfactory.class.inc.php
@@ -86,7 +86,7 @@ class MFException extends Exception
 	 */
 	public function GetSourceLineNumber()
 	{
-		return $this->iSourceLineNumber - $this->iSourceLineOffset;
+		return intval($this->iSourceLineNumber) - $this->iSourceLineOffset;
 	}
 
 	/**