diff --git a/ln.http.api/WebApiController.cs b/ln.http.api/WebApiController.cs
index c74ca9a..eab368b 100644
--- a/ln.http.api/WebApiController.cs
+++ b/ln.http.api/WebApiController.cs
@@ -53,12 +53,13 @@ namespace ln.http.api
             if (result is JSONValue jsonResult)
                 return defaultResponseFactory().Content(jsonResult);
 
-            if (!JSONMapper.DefaultMapper.Serialize(result, out JSONValue json))
-                return HttpResponse.InternalServerError().Content("Method result could not be serialized");
-                
-            result = json;
-
-            return defaultResponseFactory().Content(result.ToString());
+            if (JSONMapper.DefaultMapper.Serialize(result, out JSONValue json))
+                return defaultResponseFactory()
+                    .ContentType("application/json")
+                    .Content(result.ToString())
+                    ;
+                    
+            return HttpResponse.InternalServerError().Content("Method result could not be serialized");
         }
 
         void MapArguments(HttpRequest request, MethodInfo methodInfo,out object[] arguments, out Func<HttpResponse> defaultRepsonseFactory)