diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c
index ad17892..7e93ac9 100644
--- a/drivers/usb/misc/ldusb.c
+++ b/drivers/usb/misc/ldusb.c
@@ -464,7 +464,7 @@
 	actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
 	bytes_to_read = min(count, *actual_buffer);
 	if (bytes_to_read < *actual_buffer)
-		dev_warn(&dev->intf->dev, "Read buffer overflow, %d bytes dropped\n",
+		dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n",
 			 *actual_buffer-bytes_to_read);
 
 	/* copy one interrupt_in_buffer from ring_buffer into userspace */
@@ -528,8 +528,8 @@
 	/* write the data into interrupt_out_buffer from userspace */
 	bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
 	if (bytes_to_write < count)
-		dev_warn(&dev->intf->dev, "Write buffer overflow, %d bytes dropped\n",count-bytes_to_write);
-	dbg_info(&dev->intf->dev, "%s: count = %d, bytes_to_write = %d\n", __FUNCTION__, count, bytes_to_write);
+		dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write);
+	dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", __FUNCTION__, count, bytes_to_write);
 
 	if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
 		retval = -EFAULT;