diff --git a/lib/index.js b/lib/index.js
index 1432345..76812b5 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -97,7 +97,7 @@ function mongodbAppender(config) {
                     timestamp: loggingEvent.startTime,
                     data: loggingEvent.data,
                     level: loggingEvent.level,
-                    category: loggingEvent.logger.category
+                    category: loggingEvent.categoryName
                 }, options);
             } else {
                 // save write
@@ -105,7 +105,7 @@ function mongodbAppender(config) {
                     timestamp: loggingEvent.startTime,
                     data: loggingEvent.data,
                     level: loggingEvent.level,
-                    category: loggingEvent.logger.category
+                    category: loggingEvent.categoryName
                 }, options, function (error) {
                     if (error) {
                         console.error('log: Error writing data to log!');