Make the new stream class sealed

diff --git a/src/System.Private.CoreLib/src/System/Reflection/RuntimeAssembly.cs b/src/System.Private.CoreLib/src/System/Reflection/RuntimeAssembly.cs
index 6905d7a..0659b60 100644 (file)
--- a/src/System.Private.CoreLib/src/System/Reflection/RuntimeAssembly.cs
+++ b/src/System.Private.CoreLib/src/System/Reflection/RuntimeAssembly.cs
@@ -29,7 +29,7 @@ namespace System.Reflection
 
         #endregion
 
-        private class ManifestResourceStream : UnmanagedMemoryStream
+        private sealed class ManifestResourceStream : UnmanagedMemoryStream
         {
             private RuntimeAssembly _manifestAssembly;