diff --git a/tabulate/__init__.py b/tabulate/__init__.py
index e100c09..d958cab 100644
--- a/tabulate/__init__.py
+++ b/tabulate/__init__.py
@@ -723,7 +723,7 @@ def escape_empty(val):
 }
 
 
-tabulate_formats = list(sorted(_table_formats.keys()))
+tabulate_formats = sorted(_table_formats.keys())
 
 # The table formats for which multiline cells will be folded into subsequent
 # table rows. The key is the original format specified at the API. The value is