diff --git a/nanoc/lib/nanoc/base/entities/configuration.rb b/nanoc/lib/nanoc/base/entities/configuration.rb
index 60af3277de..3ad5224826 100644
--- a/nanoc/lib/nanoc/base/entities/configuration.rb
+++ b/nanoc/lib/nanoc/base/entities/configuration.rb
@@ -24,7 +24,7 @@ class Configuration
     # that lacks some options, the default value will be taken from
     # `DEFAULT_CONFIG`.
     DEFAULT_CONFIG = {
-      text_extensions: %w[adoc asciidoc atom css erb haml htm html js less markdown md php rb sass scss txt xhtml xml coffee hb handlebars mustache ms slim rdoc].sort,
+      text_extensions: %w[adoc asciidoc atom css erb haml htm html js less markdown md php rb sass scss tex txt xhtml xml coffee hb handlebars mustache ms slim rdoc].sort,
       lib_dirs: %w[lib],
       commands_dirs: %w[commands],
       output_dir: 'output',