diff --git a/lib/logger.js b/lib/logger.js
index da98fff..5549b62 100644
--- a/lib/logger.js
+++ b/lib/logger.js
@@ -25,7 +25,6 @@ function parseCallStack(data, skipIdx = 4) {
   return null;
 }
 
-// const _useCallStack = Symbol('useCallStack');
 /**
  * Logger to log messages.
  * use {@see log4js#getLogger(String)} to get an instance.
@@ -46,8 +45,6 @@ class Logger {
     this.category = name;
     this.context = {};
     debug(`Logger created (${this.category}, ${this.level})`);
-
-    // this[_useCallStack] = false;
   }
 
   get level() {
@@ -59,12 +56,10 @@ class Logger {
   }
 
   get useCallStack() {
-    // return this[_useCallStack];
     return categories.getEnableCallStackForCategory(this.category);
   }
 
   set useCallStack(bool) {
-    // this[_useCallStack] = (bool === true);
     categories.setEnableCallStackForCategory(this.category, (bool === true));
   }
 
@@ -81,8 +76,13 @@ class Logger {
 
   _log(level, data) {
     debug(`sending log data (${level}) to appenders`);
-    // eslint-disable-next-line max-len
-    const loggingEvent = new LoggingEvent(this.category, level, data, this.context, (this.useCallStack) && parseCallStack(new Error()));
+    const loggingEvent = new LoggingEvent(
+      this.category,
+      level,
+      data,
+      this.context,
+      (this.useCallStack) && parseCallStack(new Error())
+    );
     clustering.send(loggingEvent);
   }