diff --git a/src/Prowlarr.Http/Frontend/Mappers/IMapHttpRequestsToDisk.cs b/src/Prowlarr.Http/Frontend/Mappers/IMapHttpRequestsToDisk.cs
index 54206b844..436f6a999 100644
--- a/src/Prowlarr.Http/Frontend/Mappers/IMapHttpRequestsToDisk.cs
+++ b/src/Prowlarr.Http/Frontend/Mappers/IMapHttpRequestsToDisk.cs
@@ -7,6 +7,6 @@ namespace Prowlarr.Http.Frontend.Mappers
     {
         string Map(string resourceUrl);
         bool CanHandle(string resourceUrl);
-        Task<FileStreamResult> GetResponse(string resourceUrl);
+        Task<IActionResult> GetResponse(string resourceUrl);
     }
 }
diff --git a/src/Prowlarr.Http/Frontend/Mappers/StaticResourceMapperBase.cs b/src/Prowlarr.Http/Frontend/Mappers/StaticResourceMapperBase.cs
index b23eab209..5e0d15b71 100644
--- a/src/Prowlarr.Http/Frontend/Mappers/StaticResourceMapperBase.cs
+++ b/src/Prowlarr.Http/Frontend/Mappers/StaticResourceMapperBase.cs
@@ -31,7 +31,7 @@ namespace Prowlarr.Http.Frontend.Mappers
 
         public abstract bool CanHandle(string resourceUrl);
 
-        public Task<FileStreamResult> GetResponse(string resourceUrl)
+        public Task<IActionResult> GetResponse(string resourceUrl)
         {
             var filePath = Map(resourceUrl);
 
@@ -42,7 +42,7 @@ namespace Prowlarr.Http.Frontend.Mappers
                     contentType = "application/octet-stream";
                 }
 
-                return Task.FromResult(new FileStreamResult(GetContentStream(filePath), new MediaTypeHeaderValue(contentType)
+                return Task.FromResult<IActionResult>(new FileStreamResult(GetContentStream(filePath), new MediaTypeHeaderValue(contentType)
                 {
                     Encoding = contentType == "text/plain" ? Encoding.UTF8 : null
                 }));
@@ -50,7 +50,7 @@ namespace Prowlarr.Http.Frontend.Mappers
 
             _logger.Warn("File {0} not found", filePath);
 
-            return Task.FromResult<FileStreamResult>(null);
+            return Task.FromResult<IActionResult>(null);
         }
 
         protected virtual Stream GetContentStream(string filePath)
diff --git a/src/Prowlarr.Http/Frontend/StaticResourceController.cs b/src/Prowlarr.Http/Frontend/StaticResourceController.cs
index 55a472da9..f1836d2d3 100644
--- a/src/Prowlarr.Http/Frontend/StaticResourceController.cs
+++ b/src/Prowlarr.Http/Frontend/StaticResourceController.cs
@@ -58,7 +58,7 @@ namespace Prowlarr.Http.Frontend
 
                 if (result != null)
                 {
-                    if (result.ContentType == "text/html")
+                    if ((result as FileResult)?.ContentType == "text/html")
                     {
                         Response.Headers.DisableCache();
                     }