diff --git a/reddit/subreddit.py b/reddit/subreddit.py
index c7714ce..c64db2b 100644
--- a/reddit/subreddit.py
+++ b/reddit/subreddit.py
@@ -15,7 +15,7 @@ def get_subreddit_threads():
 
     print_step("Getting AskReddit threads...")
 
-    if os.getenv("REDDIT_2FA", default="no").lower() == "yes":
+    if os.getenv("REDDIT_2FA", default="no").casefold() == "yes":
         print(
             "\nEnter your two-factor authentication code from your authenticator app.\n"
         )