diff --git a/bin/Formatter.rb b/bin/Formatter.rb
index 74436b8b3ba..ad5ecd4dd0f 100644
--- a/bin/Formatter.rb
+++ b/bin/Formatter.rb
@@ -88,7 +88,7 @@ module Formatter
           return
       end
       # Remove double-quotes added by 'dump'.
-      return str.dump[1..-1]
+      return str.dump[1..-2]
     end
 
     def output(width, str)