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diff --git a/src/linux.cc b/src/linux.cc
index 0a7d4331..09fa6c99 100644
--- a/src/linux.cc
+++ b/src/linux.cc
@@ -1169,7 +1169,7 @@ 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 */
- size_t len_to_trunc = std::max(7UL, strnlen(buf, 255)) - 7;
+ size_t len_to_trunc = std::max((size_t)7UL, strnlen(buf, 255)) - 7;
buf[len_to_trunc] = 0;
snprintf(path, 255, "%s%s/%s%d_input", dir, dev, type, n);
fd = open(path, O_RDONLY);
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