diff --git a/mcs/class/System.Json/System.Json/JsonObject.cs b/mcs/class/System.Json/System.Json/JsonObject.cs
index 6b6373d84d58d21d54c25cd5e229033f4d52ef07..487b29694ebd3717efb2123c857252a83d344b21 100644
--- a/mcs/class/System.Json/System.Json/JsonObject.cs
+++ b/mcs/class/System.Json/System.Json/JsonObject.cs
@@ -66,8 +66,6 @@ namespace System.Json
 		{
 			if (key == null)
 				throw new ArgumentNullException ("key");
-			if (value == null)
-				throw new ArgumentNullException ("value");
 
 			map.Add (key, value);
 		}