diff --git a/lib/code2pdf/convert_to_pdf.rb b/lib/code2pdf/convert_to_pdf.rb
index 6885bcc..348ff25 100644
--- a/lib/code2pdf/convert_to_pdf.rb
+++ b/lib/code2pdf/convert_to_pdf.rb
@@ -87,7 +87,7 @@ def read_files(path = nil)
     @files ||= []
     path   ||= @from
 
-    Dir.foreach(path) do |item|
+    Dir.foreach(path).sort.each do |item|
       item_path = "#{path}/#{item}"
 
       if valid_directory?(item_path) && !%w[. ..].include?(item) && !in_directory_blacklist?(item_path)