use safe_islower to avoid UB

1 files changed, 1 insertions, 1 deletions

diff --git a/unpack.c b/unpack.c
index 995eac8..ad38a09 100644
--- a/unpack.c
+++ b/unpack.c
@@ -73,7 +73,7 @@ static void read_fields(struct dest dest, const void *src_, enum pack_endian end
 			double d = ieee754b64_deserialise(val.unsigned_);
 			val.d = d;
 			tr_debug("val.d: %f", val.d);
-		} else if (islower((char)dest.type)) {
+		} else if (safe_islower((char)dest.type)) {
 			intmax_t vals;
 			if (!(val.unsigned_ & (UINTMAX_C(1) << (s * 8 - 1)))) {
 				vals = val.unsigned_;