diff --git a/lib/log4js.js b/lib/log4js.js
index 69faa63..427f937 100644
--- a/lib/log4js.js
+++ b/lib/log4js.js
@@ -58,7 +58,11 @@ function configure(configurationFileOrObject) {
     configObject = loadConfigurationFile(configurationFileOrObject);
   }
   debug(`Configuration is ${configObject}`);
-  configuration.configure(CircularJSON.parse(CircularJSON.stringify(configObject)));
+
+  // Keep the configObject remain the same
+  // and clone it to avoid that is not configurable in appenders
+  const clonedConfigObject = CircularJSON.parse(CircularJSON.stringify(configObject));
+  configuration.configure(clonedConfigObject);
 
   clustering.onMessage(sendLogEventToAppender);