diff --git a/libfprint/fpi-usb-transfer.c b/libfprint/fpi-usb-transfer.c
index 74b5b1c..37033c8 100644
--- a/libfprint/fpi-usb-transfer.c
+++ b/libfprint/fpi-usb-transfer.c
@@ -105,6 +105,7 @@ fpi_usb_transfer_new (FpDevice * device)
 
   self = g_slice_new0 (FpiUsbTransfer);
   self->ref_count = 1;
+  self->type = FP_TRANSFER_NONE;
 
   self->device = device;
 
diff --git a/libfprint/fpi-usb-transfer.h b/libfprint/fpi-usb-transfer.h
index 40fd70c..dc7fdb6 100644
--- a/libfprint/fpi-usb-transfer.h
+++ b/libfprint/fpi-usb-transfer.h
@@ -47,10 +47,10 @@ typedef void (*FpiUsbTransferCallback)(FpiUsbTransfer *transfer,
  * Type of the transfer.
  */
 typedef enum  {
-  FP_TRANSFER_NONE = 0,
-  FP_TRANSFER_BULK,
-  FP_TRANSFER_CONTROL,
-  FP_TRANSFER_INTERRUPT,
+  FP_TRANSFER_NONE = -1,
+  FP_TRANSFER_CONTROL = 0,
+  FP_TRANSFER_BULK = 2,
+  FP_TRANSFER_INTERRUPT = 3,
 } FpiTransferType;
 
 /**