diff --git a/avrdude/ChangeLog b/avrdude/ChangeLog
index 243dc868..4f80bec1 100644
--- a/avrdude/ChangeLog
+++ b/avrdude/ChangeLog
@@ -1,3 +1,7 @@
+2005-08-30  Joerg Wunsch <j@uriah.heep.sax.de>
+
+	* usb_libusb.c: Consistently use unsigned char for buffers.
+
 2005-08-28  Joerg Wunsch <j@uriah.heep.sax.de>
 
 	* avrdude.conf.in: Add support for the ATtiny25/45/85.  Note that
diff --git a/avrdude/usb_libusb.c b/avrdude/usb_libusb.c
index d53d04b9..e801e727 100644
--- a/avrdude/usb_libusb.c
+++ b/avrdude/usb_libusb.c
@@ -178,7 +178,7 @@ static void usbdev_close(int fd)
 }
 
 
-static int usbdev_send(int fd, char *bp, size_t mlen)
+static int usbdev_send(int fd, unsigned char *bp, size_t mlen)
 {
   usb_dev_handle *udev = (usb_dev_handle *)fd;
 
@@ -213,11 +213,11 @@ usb_fill_buf(usb_dev_handle *udev)
   return 0;
 }
 
-static int usbdev_recv(int fd, char *buf, size_t nbytes)
+static int usbdev_recv(int fd, unsigned char *buf, size_t nbytes)
 {
   usb_dev_handle *udev = (usb_dev_handle *)fd;
   int i, amnt;
-  char * p = buf;
+  unsigned char * p = buf;
 
   for (i = 0; nbytes > 0;)
     {