diff --git a/lib/layouts.js b/lib/layouts.js
index 524cfd0..7b9989b 100644
--- a/lib/layouts.js
+++ b/lib/layouts.js
@@ -45,7 +45,7 @@ function timestampLevelAndCategory(loggingEvent, colour) {
     util.format(
       '[%s] [%s] %s - ',
       dateFormat.asString(loggingEvent.startTime),
-      loggingEvent.level,
+      loggingEvent.level.toString(),
       loggingEvent.categoryName
     ),
     colour