thodg/got

diff --git a/lib/deltify.c b/lib/deltify.c
index 2b5525d..ae0934b 100644
--- a/lib/deltify.c
+++ b/lib/deltify.c
@@ -248,7 +248,7 @@ stretch(struct Dtab *dt, struct Dblock *b, unsigned char *s,
 	p = s + n;
 	q = dt->base + b->off + n;
 	eb = dt->base + dt->nbase;
-	while (n < (1 << 24)) {
+	while (n < (1 << 24) - 1) {
 		if (p == e || q == eb)
 			break;
 		if (*p != *q)