diff --git a/lib/loggly/client.js b/lib/loggly/client.js
index a40cb6d..6ab7d96 100644
--- a/lib/loggly/client.js
+++ b/lib/loggly/client.js
@@ -158,7 +158,7 @@ Loggly.prototype.log = function (msg, tags, callback) {
       accept:           '*/*',
       'user-agent':     this.userAgent,
       'content-type':   this.json ? 'application/json' : 'text/plain',
-      'content-length': Buffer.byteLength(msg)
+      'content-length': Buffer.byteLength(JSON.stringify(msg))
     }
   };