diff --git a/dbus_service/dbus-service b/dbus_service/dbus-service
index 234c1d7..9750a69 100755
--- a/dbus_service/dbus-service
+++ b/dbus_service/dbus-service
@@ -24,6 +24,7 @@ from validitysensor.usb import usb
 from validitysensor.sid import sid_from_string
 from validitysensor.db import subtype_to_string, db
 from validitysensor.sensor import sensor, reboot, RebootException
+from validitysensor.winbio_constants import finger_ids
 
 GLib.threads_init()
 
@@ -129,6 +130,13 @@ class Device(dbus.service.Object):
         logging.debug('In EnrollStart %s for %s' % (finger_name, user))
         pw=pwd.getpwnam(user)
         uid=pw.pw_uid
+
+        # left-ring-finger => LH
+        hand = 'LH' if finger_name[0] == 'l' else 'RH'
+        # left-ring-finger => RING_FINGER
+        generic_finger = '_'.join(finger_name.split('-')[1:]).upper()
+        winbio_name = 'WINBIO_ANSI_381_POS_' + hand + '_' + generic_finger
+
         def update_cb(rsp, e):
             if e is not None:
                 self.EnrollStatus('enroll-retry-scan', False)
@@ -137,7 +145,7 @@ class Device(dbus.service.Object):
 
         def run():
             try:
-                sensor.enroll(uid2identity(uid), 0xf5, update_cb) # TODO parse the finger name
+                sensor.enroll(uid2identity(uid), index, update_cb)
                 self.EnrollStatus('enroll-completed', True)
             except usb_core.USBError as e:
                 logging.exception(e)
@@ -147,9 +155,17 @@ class Device(dbus.service.Object):
                 logging.exception(e)
                 self.EnrollStatus('enroll-failed', True)
 
-        thread = Thread(target=run)
-        thread.daemon = True
-        thread.start()
+        index = finger_ids.get(winbio_name, None)
+        if index == None:
+            logging.error(
+                'Unknown finger name passed to enroll? ' +
+                finger_name + ' (' + winbio_name + ')'
+            )
+            self.EnrollStatus('enroll-failed', True)
+        else:
+            thread = Thread(target=run)
+            thread.daemon = True
+            thread.start()
         
 
     @dbus.service.signal(dbus_interface=INTERFACE_NAME, signature='sb')
diff --git a/validitysensor/db.py b/validitysensor/db.py
index b6da5f2..b622ed5 100644
--- a/validitysensor/db.py
+++ b/validitysensor/db.py
@@ -8,6 +8,7 @@ from binascii import hexlify, unhexlify
 from .blobs import db_write_enable
 from .flash import call_cleanups
 from .sid import *
+from .winbio_constants import finger_names, finger_ids
 
 class UserStorage():
     def __init__(self, dbid, name):
@@ -28,10 +29,8 @@ class User():
         return '<User: dbid=%04x identity=%s fingers=%s>' % (self.dbid, repr(self.identity), repr(self.fingers))
 
 def subtype_to_string(s):
-    if s < 0xf5 or s > 0xfe:
-        return 'Unknown'
-
-    return 'WINBIO_FINGER_UNSPECIFIED_POS_%02d' % (s - 0xf5 + 1)
+    finger_name = finger_names.get(s, None)
+    return finger_name or 'Unknown'
 
 def parse_user_storage(rsp):
     rc, = unpack('<H', rsp[:2])
diff --git a/validitysensor/winbio_constants.py b/validitysensor/winbio_constants.py
new file mode 100644
index 0000000..264adb6
--- /dev/null
+++ b/validitysensor/winbio_constants.py
@@ -0,0 +1,36 @@
+finger_ids = {
+  # https://github.com/tpn/winsdk-10/blob/9b69fd26ac0c7d0b83d378dba01080e93349c2ed/Include/10.0.16299.0/shared/winbio_types.h#L864-L878
+  "WINBIO_ANSI_381_POS_UNKNOWN": 0,
+  "WINBIO_ANSI_381_POS_RH_THUMB": 1,
+  "WINBIO_ANSI_381_POS_RH_INDEX_FINGER": 2,
+  "WINBIO_ANSI_381_POS_RH_MIDDLE_FINGER": 3,
+  "WINBIO_ANSI_381_POS_RH_RING_FINGER": 4,
+  "WINBIO_ANSI_381_POS_RH_LITTLE_FINGER": 5,
+  "WINBIO_ANSI_381_POS_LH_THUMB": 6,
+  "WINBIO_ANSI_381_POS_LH_INDEX_FINGER": 7,
+  "WINBIO_ANSI_381_POS_LH_MIDDLE_FINGER": 8,
+  "WINBIO_ANSI_381_POS_LH_RING_FINGER": 9,
+  "WINBIO_ANSI_381_POS_LH_LITTLE_FINGER": 10,
+
+  "WINBIO_ANSI_381_POS_RH_FOUR_FINGERS": 13,
+  "WINBIO_ANSI_381_POS_LH_FOUR_FINGERS": 14,
+  "WINBIO_ANSI_381_POS_TWO_THUMBS": 15,
+
+
+  # https://github.com/tpn/winsdk-10/blob/9b69fd26ac0c7d0b83d378dba01080e93349c2ed/Include/10.0.16299.0/shared/winbio_types.h#L920-L929
+  "WINBIO_FINGER_UNSPECIFIED_POS_01": 0xf5,
+  "WINBIO_FINGER_UNSPECIFIED_POS_02": 0xf6,
+  "WINBIO_FINGER_UNSPECIFIED_POS_03": 0xf7,
+  "WINBIO_FINGER_UNSPECIFIED_POS_04": 0xf8,
+  "WINBIO_FINGER_UNSPECIFIED_POS_05": 0xf9,
+  "WINBIO_FINGER_UNSPECIFIED_POS_06": 0xfa,
+  "WINBIO_FINGER_UNSPECIFIED_POS_07": 0xfb,
+  "WINBIO_FINGER_UNSPECIFIED_POS_08": 0xfc,
+  "WINBIO_FINGER_UNSPECIFIED_POS_09": 0xfd,
+  "WINBIO_FINGER_UNSPECIFIED_POS_10": 0xfe
+}
+
+# Store the keys in the reverse order for faster lookups
+finger_names = {}
+for name, index in finger_ids.items():
+  finger_names[index] = name