diff --git a/MediaBrowser.Server.Implementations/HttpServer/HttpResultFactory.cs b/MediaBrowser.Server.Implementations/HttpServer/HttpResultFactory.cs
index 194904320..27065d0f5 100644
--- a/MediaBrowser.Server.Implementations/HttpServer/HttpResultFactory.cs
+++ b/MediaBrowser.Server.Implementations/HttpServer/HttpResultFactory.cs
@@ -534,7 +534,7 @@ namespace MediaBrowser.Server.Implementations.HttpServer
             if (lastDateModified.HasValue && (string.IsNullOrEmpty(cacheKey) || cacheDuration.HasValue))
             {
                 AddAgeHeader(responseHeaders, lastDateModified);
-                responseHeaders["LastModified"] = lastDateModified.Value.ToString("r");
+                responseHeaders["Last-Modified"] = lastDateModified.Value.ToString("r");
             }
 
             if (cacheDuration.HasValue)