diff --git a/modules/upscaler.py b/modules/upscaler.py
index cc662fc9c..9d13ee993 100644
--- a/modules/upscaler.py
+++ b/modules/upscaler.py
@@ -20,7 +20,7 @@ class Upscaler:
     filter = None
     model = None
     user_path = None
-    scalers = []
+    scalers: list = []
     tile = True
 
     def __init__(self, create_dirs=False):