diff --git a/main.py b/main.py
index a387ea7..e9de92f 100644
--- a/main.py
+++ b/main.py
@@ -105,10 +105,10 @@ class CliInteraction(UserInteraction):
         print("User Verification required.")
         return True
 
+clf = nfc.ContactlessFrontend('usb')
 def read_nfc_tag():
     clf = None
     try:
-        clf = nfc.ContactlessFrontend('usb')
         tag = clf.connect(rdwr={'on-connect': lambda tag: False})
         return tag.identifier if tag else None
     except Exception as e: