diff --git a/main.py b/main.py
index b081e77b..8552ba8f 100644
--- a/main.py
+++ b/main.py
@@ -19,7 +19,7 @@ presets = {
 with open('set_info') as data_file:
     setinfos = commentjson.load(data_file)
 
-with open('cards_manual.json') as data_file:
+with open('cards_manual') as data_file:
     manual_sets = json.load(data_file)
 
 with open('cards_corrections') as data_file: