Fix signedness warning

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/optparse/optparse.c b/lib/optparse/optparse.c
index 07eaa4a..6f9e4bf 100644
--- a/lib/optparse/optparse.c
+++ b/lib/optparse/optparse.c
@@ -142,7 +142,7 @@ error_s(struct optparse *st, const char *msg, const char *s)
 {
 	const char *p = strchr(s, '=');
 	snprintf(st->errmsg, sizeof(st->errmsg), u8"%s — ‘%.*s’", msg,
-	         (int)(p ? p - s : strlen(s)), s);
+	         (int)(p ? (size_t)(p - s) : strlen(s)), s);
 	return -1;
 }