1 files changed, 1 insertions, 1 deletions
diff --git a/src/mscorlib/shared/System/Reflection/TypeDelegator.cs b/src/mscorlib/shared/System/Reflection/TypeDelegator.cs
index 7f928d2486..bcbff05d62 100644
--- a/src/mscorlib/shared/System/Reflection/TypeDelegator.cs
+++ b/src/mscorlib/shared/System/Reflection/TypeDelegator.cs
@@ -10,7 +10,6 @@ using CultureInfo = System.Globalization.CultureInfo;
 
 namespace System.Reflection
 {
-    [Serializable]
     public class TypeDelegator : TypeInfo
     {
         public override bool IsAssignableFrom(TypeInfo typeInfo)
@@ -100,6 +99,7 @@ namespace System.Reflection
 
         protected override TypeAttributes GetAttributeFlagsImpl() => typeImpl.Attributes;
 
+        public override bool IsTypeDefinition => typeImpl.IsTypeDefinition;
         public override bool IsSZArray => typeImpl.IsSZArray;
 
         protected override bool IsArrayImpl() => typeImpl.IsArray;