diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index b31e09b099ef8d9b93826899108b1db8948febda..0c4b43533268d2ae07accac38518106dcd689695 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1483,10 +1483,10 @@ static int ftdi_FT2232C_startup (struct usb_serial *serial)
 	inter = serial->interface->altsetting->desc.bInterfaceNumber;
 
 	if (inter) {
-		priv->interface = INTERFACE_B;
+		priv->interface = PIT_SIOB;
 	}
 	else  {
-		priv->interface = INTERFACE_A;
+		priv->interface = PIT_SIOA;
 	}
 	priv->baud_base = 48000000 / 2; /* Would be / 16, but FT2232C supports multiple of 0.125 divisor fractions! */
 	
diff --git a/drivers/usb/serial/ftdi_sio.h b/drivers/usb/serial/ftdi_sio.h
index 3734b5e339a065c07ae82be6804ce7e0e204e972..96be36441149fccfe67d189792d2ffe62a1bb26b 100644
--- a/drivers/usb/serial/ftdi_sio.h
+++ b/drivers/usb/serial/ftdi_sio.h
@@ -279,10 +279,6 @@
 #define FTDI_SIO_SET_LATENCY_TIMER	9 /* Set the latency timer */
 #define FTDI_SIO_GET_LATENCY_TIMER	10 /* Get the latency timer */
 
-/* Port interface code for FT2232C */
-#define INTERFACE_A		1
-#define INTERFACE_B		2
-
 
 /*
  *   BmRequestType:  1100 0000b