diff --git a/libfprint/drivers/vfs301_proto.c b/libfprint/drivers/vfs301_proto.c
index 84e2318..2bf8bbd 100644
--- a/libfprint/drivers/vfs301_proto.c
+++ b/libfprint/drivers/vfs301_proto.c
@@ -67,7 +67,8 @@ static void
 usb_recv (FpDeviceVfs301 *dev, guint8 endpoint, int max_bytes, FpiUsbTransfer **out, GError **error)
 {
   GError *err = NULL;
-  FpiUsbTransfer *transfer;
+
+  g_autoptr(FpiUsbTransfer) transfer = NULL;
 
   /* XXX: This function swallows any transfer errors, that is obviously
    *      quite bad (it used to assert on no-error)! */
@@ -78,7 +79,6 @@ usb_recv (FpDeviceVfs301 *dev, guint8 endpoint, int max_bytes, FpiUsbTransfer **
 
   fpi_usb_transfer_submit_sync (transfer, VFS301_DEFAULT_WAIT_TIMEOUT, &err);
 
-
 #ifdef DEBUG
   usb_print_packet (0, err, transfer->buffer, transfer->actual_length);
 #endif
@@ -97,7 +97,8 @@ static void
 usb_send (FpDeviceVfs301 *dev, const guint8 *data, gssize length, GError **error)
 {
   GError *err = NULL;
-  FpiUsbTransfer *transfer = NULL;
+
+  g_autoptr(FpiUsbTransfer) transfer = NULL;
 
   /* XXX: This function swallows any transfer errors, that is obviously
    *      quite bad (it used to assert on no-error)! */