1 files changed, 3 insertions, 4 deletions
diff --git a/src/mscorlib/src/System/OperatingSystem.cs b/src/mscorlib/src/System/OperatingSystem.cs
index 6955310acf..a11d4bcce8 100644
--- a/src/mscorlib/src/System/OperatingSystem.cs
+++ b/src/mscorlib/src/System/OperatingSystem.cs
@@ -38,11 +38,11 @@ namespace System {
             if( platform < PlatformID.Win32S || platform > PlatformID.MacOSX) {
                 throw new ArgumentException(
                     Environment.GetResourceString("Arg_EnumIllegalVal", (int)platform),
-                    "platform");
+                    nameof(platform));
             }
 
             if ((Object) version == null)
-                throw new ArgumentNullException("version");
+                throw new ArgumentNullException(nameof(version));
             Contract.EndContractBlock();
 
             _platform = platform;
@@ -71,10 +71,9 @@ namespace System {
             }
         }
 
-        [System.Security.SecurityCritical]  // auto-generated_required
         public void GetObjectData(SerializationInfo info, StreamingContext context) {
             if( info == null ) {
-                throw new ArgumentNullException("info");
+                throw new ArgumentNullException(nameof(info));
             }
             Contract.EndContractBlock();