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diff --git a/src/linux.cc b/src/linux.cc
index affa1de1..67d4662e 100644
--- a/src/linux.cc
+++ b/src/linux.cc
@@ -1171,7 +1171,7 @@ static int open_sysfs_sensor(const char *dir, const char *dev, const char *type,
fd = open(path, O_RDONLY);
if (fd < 0) {
/* if it fails, strip the /device from dev and attempt again */
- buf[std::max(0UL, strnlen(buf, 255) - 7)] = 0;
+ buf[std::max((size_t)0UL, strnlen(buf, 255) - 7)] = 0;
snprintf(path, 255, "%s%s/%s%d_input", dir, dev, type, n);
fd = open(path, O_RDONLY);
if (fd < 0) {
diff --git a/src/mail.cc b/src/mail.cc
index 19dd1af8..fbcc4e2a 100644
--- a/src/mail.cc
+++ b/src/mail.cc
@@ -302,7 +302,7 @@ static void update_mail_count(struct local_mail_s *mail) {
}
closedir(dir);
- dirname[std::max(0UL, strnlen(dirname, dirname_len - 1) - 3)] = '\0';
+ dirname[std::max((size_t)0UL, strnlen(dirname, dirname_len - 1) - 3)] = '\0';
strcat(dirname, "new");
dir = opendir(dirname);
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