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-rw-r--r--util/nvramtool/cmos_ops.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/util/nvramtool/cmos_ops.c b/util/nvramtool/cmos_ops.c
index 86ffe1022b..2bbc8a1df6 100644
--- a/util/nvramtool/cmos_ops.c
+++ b/util/nvramtool/cmos_ops.c
@@ -125,7 +125,7 @@ int prepare_cmos_write(const cmos_entry_t * e, const char value_str[],
/* See if the first character of 'value_str' (excluding
* any initial whitespace) is a minus sign.
*/
- for (p = value_str; isspace(*p); p++) ;
+ for (p = value_str; isspace((int)(unsigned char)*p); p++) ;
negative = (*p == '-');
out = strtoull(value_str, (char **)&p, 0);