diff --git a/src/libraries/shims/mscorlib/src/mscorlib.cs b/src/libraries/shims/mscorlib/src/mscorlib.cs
index 857e2a83bfc48e..eb77227a1130a0 100644
--- a/src/libraries/shims/mscorlib/src/mscorlib.cs
+++ b/src/libraries/shims/mscorlib/src/mscorlib.cs
@@ -109,3 +109,9 @@
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 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Threading.Tasks.Sources.ValueTaskSourceOnCompletedFlags))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Threading.Tasks.Sources.ValueTaskSourceStatus))]
+// These types are required for back-compatibility with .NET Framework and previous versions of .NETCoreApp. -->
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Reflection.Emit.PEFileKinds))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.InteropServices.AssemblyRegistrationFlags))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.InteropServices.ExporterEventKind))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.InteropServices.RegistrationClassContext))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.InteropServices.RegistrationConnectionType))]