diff --git a/src/Microsoft.Owin.Security.OAuth/OAuthAuthorizationServerHandler.cs b/src/Microsoft.Owin.Security.OAuth/OAuthAuthorizationServerHandler.cs
index b6c89e5b..3dc696fd 100644
--- a/src/Microsoft.Owin.Security.OAuth/OAuthAuthorizationServerHandler.cs
+++ b/src/Microsoft.Owin.Security.OAuth/OAuthAuthorizationServerHandler.cs
@@ -476,7 +476,7 @@ private async Task InvokeTokenEndpointAsync()
             Response.Headers.Set("Cache-Control", "no-cache");
             Response.Headers.Set("Pragma", "no-cache");
             Response.Headers.Set("Expires", "-1");
-            Response.ContentLength = memory.ToArray().Length;
+            Response.ContentLength = body.Length;
             await Response.WriteAsync(body, Request.CallCancelled);
         }