diff --git a/lib/log4js.js b/lib/log4js.js
index 072330d..427f937 100644
--- a/lib/log4js.js
+++ b/lib/log4js.js
@@ -22,6 +22,7 @@
  */
 const debug = require('debug')('log4js:main');
 const fs = require('fs');
+const CircularJSON = require('circular-json');
 const configuration = require('./configuration');
 const layouts = require('./layouts');
 const levels = require('./levels');
@@ -57,7 +58,11 @@ function configure(configurationFileOrObject) {
     configObject = loadConfigurationFile(configurationFileOrObject);
   }
   debug(`Configuration is ${configObject}`);
-  configuration.configure(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);
 
diff --git a/package-lock.json b/package-lock.json
index 93d1df0..763c511 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -323,9 +323,9 @@
       "dev": true
     },
     "circular-json": {
-      "version": "0.5.4",
-      "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.5.4.tgz",
-      "integrity": "sha512-vnJA8KS0BfOihugYEUkLRcnmq21FbuivbxgzDLXNs3zIk4KllV4Mx4UuTzBXht9F00C7QfD1YqMXg1zP6EXpig=="
+      "version": "0.5.5",
+      "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.5.5.tgz",
+      "integrity": "sha512-13YaR6kiz0kBNmIVM87Io8Hp7bWOo4r61vkEANy8iH9R9bc6avud/1FT0SBpqR1RpIQADOh/Q+yHZDA1iL6ysA=="
     },
     "clean-yaml-object": {
       "version": "0.1.0",
diff --git a/package.json b/package.json
index 755a32c..d2925e7 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "lib": "lib"
   },
   "dependencies": {
-    "circular-json": "^0.5.4",
+    "circular-json": "^0.5.5",
     "date-format": "^1.2.0",
     "debug": "^3.1.0",
     "streamroller": "0.7.0"