diff --git a/lib/register/assembler.rb b/lib/register/assembler.rb
index 84b0524d..dec3cdc5 100644
--- a/lib/register/assembler.rb
+++ b/lib/register/assembler.rb
@@ -29,6 +29,7 @@ module Register
       @objects.each do |id , slot|
         next unless slot.object.is_a? Virtual::CompiledMethod
         slot.position = at
+        slot.object.set_position at
         at += slot.length
       end
       @objects.each do |id , slot|
diff --git a/lib/register/instruction.rb b/lib/register/instruction.rb
index 9b6326ed..0bdb7179 100644
--- a/lib/register/instruction.rb
+++ b/lib/register/instruction.rb
@@ -17,6 +17,7 @@ module Register
       @attributes = options
     end
     attr_reader :attributes
+    attr_accessor :position
     def opcode
       @attributes[:opcode]
     end