diff --git a/api/ble.py b/api/ble.py
index c8b3ad8..05435ec 100644
--- a/api/ble.py
+++ b/api/ble.py
@@ -235,7 +235,7 @@ def read_data_sync(mac: str) -> Optional[SensorReading]:
 # --------------------------------------------------------------------------- #
 def reset_adapter():
     log.info("Restting BT Adapter...")
-    if current_usb_id.len() > 0:
+    if len(current_usb_id) > 0:
         log.warning(f"Doing big reset - USB ID {current_usb_id}")
         log.info(subprocess.run(["usbreset", current_usb_id], capture_output=True, text=True, check=True).stdout.strip())
         time.sleep(2)