diff --git a/Gemfile b/Gemfile
index daf7a3c..ccc8ea7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ gem "opal"
 gem 'opal-sprockets'
 gem 'opal-browser'
 
-gem "rubyx" , "0.6" , :path => "../rubyx"
+gem "rubyx" , "0.6" , path: "../rubyx"
 
 gem "rx-file" , :git => "https://github.com/ruby-x/rx-file"
 
diff --git a/lib/views/mom_view.rb b/lib/views/mom_view.rb
index d41f01c..c9630aa 100644
--- a/lib/views/mom_view.rb
+++ b/lib/views/mom_view.rb
@@ -18,9 +18,10 @@ class MomView < ListView
   def instruction_changed
     i = @interpreter.instruction
     return unless i && i.source.is_a?(Mom::Instruction)
+    return if i.source == @current
+    @current = i.source
     @element.at_css(".mom_bright").remove_class("mom_bright")
-    instruction_text = i.source.to_s
-    instruction = append_view( ConstantView.new( "span.mom_bright" , instruction_text ) )
+    instruction = append_view( ConstantView.new( "span.mom_bright" , @current.to_s ) )
     wrap_node_with( instruction , div )
     remove_first if( @elements.length > 6)
   end