diff --git a/bin/stats b/bin/stats
index 27add29..d17fe12 100755
--- a/bin/stats
+++ b/bin/stats
@@ -113,7 +113,7 @@ class StatsHandler(http.server.SimpleHTTPRequestHandler):
 
         self.send_response(200)
         self.send_header('Content-Type', 'application/json')
-        self.send_header('Content-Length', len(response))
+        self.send_header('Content-Length', str(len(response)))
         self.end_headers()
         self.wfile.write(response)