1 files changed, 2 insertions, 1 deletions
diff --git a/Emby.Server.Implementations/HttpServer/HttpResultFactory.cs b/Emby.Server.Implementations/HttpServer/HttpResultFactory.cs
index f65331ec7..313db6a75 100644
--- a/Emby.Server.Implementations/HttpServer/HttpResultFactory.cs
+++ b/Emby.Server.Implementations/HttpServer/HttpResultFactory.cs
@@ -100,7 +100,8 @@ namespace Emby.Server.Implementations.HttpServer
                 responseHeaders = new Dictionary<string, string>();
             }
 
-            if (addCachePrevention)
+            string expires;
+            if (addCachePrevention && !responseHeaders.TryGetValue("Expires", out expires))
             {
                 responseHeaders["Expires"] = "-1";
             }