X-Git-Url: https://review.openocd.org/gitweb?a=blobdiff_plain;f=src%2Fjtag%2Fdrivers%2Fusb_blaster%2Fusb_blaster.c;h=d64a7ea827a3cbe3adff2f09897bc9c13c99022f;hb=31496c2bedd367ea4282328da42c997c85d67c2e;hp=5335ce4e9ed8136fa6d279d135bba7c5652e143e;hpb=b27c53354d35a273aa1dc4283463cbdec8981632;p=openocd.git

diff --git a/src/jtag/drivers/usb_blaster/usb_blaster.c b/src/jtag/drivers/usb_blaster/usb_blaster.c
index 5335ce4e9e..d64a7ea827 100644
--- a/src/jtag/drivers/usb_blaster/usb_blaster.c
+++ b/src/jtag/drivers/usb_blaster/usb_blaster.c
@@ -952,7 +952,7 @@ COMMAND_HANDLER(ublast_handle_pin_command)
 
 		if (strlen(pin_value) > 1)
 			val = '?';
-		switch (tolower(val)) {
+		switch (tolower((unsigned char)val)) {
 		case '0':
 			*steer = FIXED_0;
 			break;