1 files changed, 1 insertions, 1 deletions
diff --git a/utils.c b/utils.c
index f8dca52..d8bb7bd 100644
--- a/utils.c
+++ b/utils.c
@@ -50,7 +50,7 @@ uint64_t str_to_unsigned(struct string str, uint8_t *err) {
 		case '8':
 		case '9':
 			val *= 10;
-			val += str.data[0] - 0x30;
+			val += (uint8_t)(str.data[0] - 0x30);
 			break;
 		default:
 			*err = 1;