diff --git a/Sources/KituraNet/HTTP/HTTPServer.swift b/Sources/KituraNet/HTTP/HTTPServer.swift
index eea14f9b..4af87d51 100644
--- a/Sources/KituraNet/HTTP/HTTPServer.swift
+++ b/Sources/KituraNet/HTTP/HTTPServer.swift
@@ -333,7 +333,7 @@ class HTTPDummyServerDelegate: ServerDelegate {
             response.statusCode = .notFound
             let theBody = "Path not found"
             response.headers["Content-Type"] = ["text/plain"]
-            response.headers["Content-Length"] = [String(theBody.lengthOfBytes(using: .utf8))]
+            response.headers["Content-Length"] = [String(theBody.utf8.count)]
             try response.write(from: theBody)
             try response.end()
         }