diff --git a/src/GToolkit-Coder/GtRefactoryChangeManager.class.st b/src/GToolkit-Coder/GtRefactoryChangeManager.class.st
index e85dc873..fb811979 100644
--- a/src/GToolkit-Coder/GtRefactoryChangeManager.class.st
+++ b/src/GToolkit-Coder/GtRefactoryChangeManager.class.st
@@ -19,7 +19,8 @@ Class {
 { #category : #'class initialization' }
 GtRefactoryChangeManager class >> initialize [
 	self nuke.
-	UndoSize := 200
+	UndoSize := 200.
+	SessionManager default registerUserClassNamed: self name
 ]
 
 { #category : #accessing }
@@ -33,6 +34,13 @@ GtRefactoryChangeManager class >> nuke [
 	Instance := nil
 ]
 
+{ #category : #'system startup' }
+GtRefactoryChangeManager class >> startUp: isImageStarting [
+	"Ensure the instance exists."
+
+	self instance
+]
+
 { #category : #accessing }
 GtRefactoryChangeManager class >> undoSize [
 	^ UndoSize