diff --git a/dotnet/src/webdriver/Command.cs b/dotnet/src/webdriver/Command.cs
index fd35c386de0bb..a0a146b3f00bb 100644
--- a/dotnet/src/webdriver/Command.cs
+++ b/dotnet/src/webdriver/Command.cs
@@ -157,6 +157,7 @@ private static Dictionary<string, object> ConvertParametersFromJson(string value
     // Selenium WebDriver types
     [JsonSerializable(typeof(char[]))]
     [JsonSerializable(typeof(byte[]))]
+    [JsonSerializable(typeof(Chromium.ChromiumNetworkConditions))]
     [JsonSerializable(typeof(Cookie))]
     [JsonSerializable(typeof(ReturnedCookie))]
     [JsonSerializable(typeof(Proxy))]