diff --git a/backend/server.py b/backend/server.py
index 424933bc..d2b16b5c 100644
--- a/backend/server.py
+++ b/backend/server.py
@@ -39,6 +39,9 @@ SUPABASE_URL = os.environ.get('SUPABASE_URL')
 SUPABASE_KEY = os.environ.get('SUPABASE_KEY')
 supabase: Client = create_client(SUPABASE_URL, SUPABASE_KEY)
 
+# Cloudflare Turnstile
+TURNSTILE_SECRET_KEY = os.environ.get('TURNSTILE_SECRET_KEY')
+
 def get_substrate():
     global substrate
     if substrate is None: