diff --git a/tests/detect-usb.py b/tests/detect-usb.py
index 1180a99..504eb01 100755
--- a/tests/detect-usb.py
+++ b/tests/detect-usb.py
@@ -51,9 +51,9 @@ for device in iter(monitor.poll, None):
                         if partition.device == device.device_node:
                             print("Mounted at {}".format(partition.mountpoint))
                             statvfs = os.statvfs(partition.mountpoint)
-                            print("size %4.1fGB" % 
+                            print("size %4.1fGB" %
                                   (statvfs.f_frsize * statvfs.f_blocks // 1024 // 1024 / 1024))
-                            print("used %4.1fGB" % 
+                            print("used %4.1fGB" %
                                   (statvfs.f_frsize * (statvfs.f_blocks - statvfs.f_bfree) // 1024 // 1024 / 1024))
                             found = True
                     loop += 1