diff --git a/src/calibre/devices/scanner.py b/src/calibre/devices/scanner.py
index 6547334b8f..380dcb7440 100644
--- a/src/calibre/devices/scanner.py
+++ b/src/calibre/devices/scanner.py
@@ -56,6 +56,8 @@ class WinPNPScanner(object):
     def drive_order(self, pnp_id):
         order = 0
         match = re.search(r'REV_.*?&(\d+)#', pnp_id)
+        if match is None:
+            match = re.search(r'REV_.*?&(\d+)', pnp_id)
         if match is not None:
             order = int(match.group(1))
         return order