diff --git a/ArchiSteamFarm/IPC/Startup.cs b/ArchiSteamFarm/IPC/Startup.cs
index 7eefbf194..fe2b220b5 100644
--- a/ArchiSteamFarm/IPC/Startup.cs
+++ b/ArchiSteamFarm/IPC/Startup.cs
@@ -354,14 +354,7 @@ namespace ArchiSteamFarm.IPC {
 			mvc.AddApiExplorer();
 #endif
 
-#if NETFRAMEWORK
-			// Add JSON formatters that will be used as default ones if no specific formatters are asked for
-			mvc.AddJsonFormatters();
-
-			mvc.AddJsonOptions(
-#else
 			mvc.AddNewtonsoftJson(
-#endif
 				static options => {
 					// Fix default contract resolver to use original names and not a camel case
 					options.SerializerSettings.ContractResolver = new DefaultContractResolver();
diff --git a/ArchiSteamFarm/IPC/WebUtilities.cs b/ArchiSteamFarm/IPC/WebUtilities.cs
index c33af3c83..7d2b35b1d 100644
--- a/ArchiSteamFarm/IPC/WebUtilities.cs
+++ b/ArchiSteamFarm/IPC/WebUtilities.cs
@@ -21,6 +21,7 @@
 
 #if NETFRAMEWORK
 using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.DependencyInjection;
 #endif
 using System;
@@ -42,6 +43,23 @@ namespace ArchiSteamFarm.IPC {
 			return services.AddMvcCore();
 		}
 
+		internal static IMvcCoreBuilder AddNewtonsoftJson(this IMvcCoreBuilder mvc, Action<MvcJsonOptions> setupAction) {
+			if (mvc == null) {
+				throw new ArgumentNullException(nameof(mvc));
+			}
+
+			if (setupAction == null) {
+				throw new ArgumentNullException(nameof(setupAction));
+			}
+
+			// Add JSON formatters that will be used as default ones if no specific formatters are asked for
+			mvc.AddJsonFormatters();
+
+			mvc.AddJsonOptions(setupAction);
+
+			return mvc;
+		}
+
 		internal static IServiceCollection AddRequestLocalization(this IServiceCollection services, Action<RequestLocalizationOptions> action) {
 			if (services == null) {
 				throw new ArgumentNullException(nameof(services));