diff --git a/lib/appenders/redis.js b/lib/appenders/redis.js
index f1204e6..8c5de99 100644
--- a/lib/appenders/redis.js
+++ b/lib/appenders/redis.js
@@ -7,14 +7,14 @@ const util = require('util');
 function redisAppender(host, port, pass, channel, layout) {
   layout = layout || layouts.messagePassThroughLayout;
   const redisClient = redis.createClient(port, host, { auth_pass: pass });
-  redisClient.on('error', function (err) {
+  redisClient.on('error', (error) => {
     if (err) {
       console.error('log4js.redisAppender - %s:%p Error: %s', host, port, util.inspect(err));
     }
   });
   return function (loggingEvent) {
     const message = layout(loggingEvent);
-    redisClient.publish(channel, message, function (err) {
+    redisClient.publish(channel, message, (error) => {
       if (err) {
         console.error('log4js.redisAppender - %s:%p Error: %s', host, port, util.inspect(err));
       }