diff options
Diffstat (limited to 'ft2232_spi.c')
| -rw-r--r-- | ft2232_spi.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/ft2232_spi.c b/ft2232_spi.c index ee2b693..a2ea2a8 100644 --- a/ft2232_spi.c +++ b/ft2232_spi.c @@ -148,7 +148,7 @@ int ft2232_spi_init(void) free(arg); arg = extract_programmer_param("port"); if (arg) { - switch (toupper(*arg)) { + switch (toupper((unsigned char)*arg)) { case 'A': ft2232_interface = INTERFACE_A; break; |
