diff --git a/src/NzbDrone.Api/Authentication/EnableAuthInNancy.cs b/src/NzbDrone.Api/Authentication/EnableAuthInNancy.cs
index 84582904e..2521663ae 100644
--- a/src/NzbDrone.Api/Authentication/EnableAuthInNancy.cs
+++ b/src/NzbDrone.Api/Authentication/EnableAuthInNancy.cs
@@ -74,8 +74,8 @@ namespace NzbDrone.Api.Authentication
         {
             if (context.Request.IsApiRequest())
             {
-                if ((context.Response.StatusCode == HttpStatusCode.SeeOther && 
-                     context.Response.ContentType.Equals("text/html", StringComparison.InvariantCultureIgnoreCase)) ||
+                if ((context.Response.StatusCode == HttpStatusCode.SeeOther &&
+                     context.Response.Headers["Location"].StartsWith("/login", StringComparison.InvariantCultureIgnoreCase)) ||
                     context.Response.StatusCode == HttpStatusCode.Unauthorized)
                 {
                     context.Response = new { Error = "Unauthorized" }.AsResponse(HttpStatusCode.Unauthorized);