diff --git a/src/MethodProxies/MpMethodProxy.class.st b/src/MethodProxies/MpMethodProxy.class.st
index 7d14c48..b97d790 100644
--- a/src/MethodProxies/MpMethodProxy.class.st
+++ b/src/MethodProxies/MpMethodProxy.class.st
@@ -26,7 +26,7 @@ This package is developed and maintained by S. Ducasse, G. Polito and P. Tesone,
 "
 Class {
 	#name : #MpMethodProxy,
-	#superclass : #ProtoObject,
+	#superclass : #Object,
 	#instVars : [
 		'selector',
 		'methodClass',
@@ -37,6 +37,14 @@ Class {
 	#category : #MethodProxies
 }
 
+{ #category : #'reflective operations' }
+MpMethodProxy class >> doesNotUnderstand: aMessage [
+
+	^ CompiledMethod 
+		  perform: aMessage selector
+		  withArguments: aMessage arguments
+]
+
 { #category : #'instance creation' }
 MpMethodProxy class >> on: selector inClass: aClass handler: aHandler [
 
@@ -69,6 +77,14 @@ MpMethodProxy >> = anObject [
 	^ self == anObject
 ]
 
+{ #category : #accessing }
+MpMethodProxy >> calypsoEnvironmentType [
+	^ proxifiedMethod 
+			ifNotNil: [ proxifiedMethod calypsoEnvironmentType ]
+			ifNil: [ super calypsoEnvironmentType ]
+			
+]
+
 { #category : #initialization }
 MpMethodProxy >> class: aClass selector: aSymbol [