Index: src/main/php/configurators/LoggerConfiguratorIni.php
===================================================================
--- src/main/php/configurators/LoggerConfiguratorIni.php	(revision 948477)
+++ src/main/php/configurators/LoggerConfiguratorIni.php	(working copy)
@@ -361,13 +361,10 @@
 	 * @param string $loggerName
 	 */
 	private function parseAdditivityForLogger($props, Logger $cat, $loggerName) {
-		$value = LoggerOptionConverter::findAndSubst(self::ADDITIVITY_PREFIX . $loggerName, $props);
+		$value = LoggerOptionConverter::findAndSubst(self::ADDITIVITY_PREFIX . $loggerName, $props);		
 		
-		// touch additivity only if necessary
-		if(!empty($value)) {
-			$additivity = LoggerOptionConverter::toBoolean($value, true);
-			$cat->setAdditivity($additivity);
-		}
+		$additivity = LoggerOptionConverter::toBoolean($value, true);
+		$cat->setAdditivity($additivity);
 	}
 
 	/**