diff --git a/lib/parfait/typed_method.rb b/lib/parfait/typed_method.rb
index 8b5729d5..4e783633 100644
--- a/lib/parfait/typed_method.rb
+++ b/lib/parfait/typed_method.rb
@@ -24,7 +24,6 @@ module Parfait
     attr_reader :name , :risc_instructions , :for_type , :cpu_instructions
     attr_reader :arguments_type , :frame_type , :binary , :next_method
 
-    # not part of the parfait model, hence ruby accessor
     attr_accessor :source
 
     def initialize( type , name , arguments_type , frame_type)
diff --git a/lib/risc/boot.rb b/lib/risc/boot.rb
index eae07d36..f1315fc6 100644
--- a/lib/risc/boot.rb
+++ b/lib/risc/boot.rb
@@ -152,7 +152,7 @@ module Risc
                       super_class_name: :Word , instance_names: :List },
           Dictionary: {keys: :List , values: :List  } ,
           CacheEntry: {cached_type: :Type , cached_method: :TypedMethod  } ,
-          TypedMethod: {name: :Word, source: :Object, risc_instructions: :Object,
+          TypedMethod: {name: :Word, risc_instructions: :Object,
                         cpu_instructions: :Object, binary: :BinaryCode,
                         arguments_type: :Type , for_type: :Type, frame_type: :Type ,
                         next_method: :TypedMethod} ,