diff --git a/app/lib/jekyll/readers/data_reader_decorator.rb b/app/lib/jekyll/readers/data_reader_decorator.rb
index 9fed7ac7..2a2a8fc2 100644
--- a/app/lib/jekyll/readers/data_reader_decorator.rb
+++ b/app/lib/jekyll/readers/data_reader_decorator.rb
@@ -14,6 +14,8 @@ module Jekyll
       extend ActiveSupport::Concern
 
       included do
+        DATA_EXTENSIONS = %w[.yaml .yml .json .csv .tsv].freeze
+
         def read_data_to(dir, data)
           return unless File.directory?(dir) && !@entry_filter.symlink?(dir)
 
@@ -24,7 +26,7 @@ module Jekyll
 
             if File.directory?(path)
               read_data_to(path, data[sanitize_filename(entry)] = {})
-            else
+            elsif DATA_EXTENSIONS.include?(File.extname(entry))
               key = sanitize_filename(File.basename(entry, ".*"))
               data[key] = read_data_file(path)
             end