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-rw-r--r--src/flash/mflash.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/flash/mflash.c b/src/flash/mflash.c
index 123d61ce..5c8ca8c1 100644
--- a/src/flash/mflash.c
+++ b/src/flash/mflash.c
@@ -1345,7 +1345,8 @@ COMMAND_HANDLER(mg_bank_cmd)
char *str;
mflash_bank->rst_pin.num = strtoul(CMD_ARGV[2], &str, 0);
if (*str)
- mflash_bank->rst_pin.port[0] = (uint16_t)tolower(str[0]);
+ mflash_bank->rst_pin.port[0] = (uint16_t)
+ tolower((unsigned)str[0]);
mflash_bank->target = target;