diff --git a/index-pack.c b/index-pack.c
index 541d7bc1c1..babe34b2db 100644
--- a/index-pack.c
+++ b/index-pack.c
@@ -68,9 +68,9 @@ static void parse_pack_header(void)
 	hdr = (void *)pack_base;
 	if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
 		die("packfile '%s' signature mismatch", pack_name);
-	if (hdr->hdr_version != htonl(PACK_VERSION))
-		die("packfile '%s' version %d different from ours %d",
-		    pack_name, ntohl(hdr->hdr_version), PACK_VERSION);
+	if (!pack_version_ok(hdr->hdr_version))
+		die("packfile '%s' version %d unsupported",
+		    pack_name, ntohl(hdr->hdr_version));
 
 	nr_objects = ntohl(hdr->hdr_entries);
 
diff --git a/pack-check.c b/pack-check.c
index 511f29424a..67a7ecdf16 100644
--- a/pack-check.c
+++ b/pack-check.c
@@ -16,9 +16,9 @@ static int verify_packfile(struct packed_git *p)
 	hdr = p->pack_base;
 	if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
 		return error("Packfile %s signature mismatch", p->pack_name);
-	if (hdr->hdr_version != htonl(PACK_VERSION))
-		return error("Packfile version %d different from ours %d",
-			     ntohl(hdr->hdr_version), PACK_VERSION);
+	if (!pack_version_ok(hdr->hdr_version))
+		return error("Packfile version %d unsupported",
+			     ntohl(hdr->hdr_version));
 	nr_objects = ntohl(hdr->hdr_entries);
 	if (num_packed_objects(p) != nr_objects)
 		return error("Packfile claims to have %d objects, "
diff --git a/pack.h b/pack.h
index 657deaa3f4..9dafa2b6d2 100644
--- a/pack.h
+++ b/pack.h
@@ -21,6 +21,7 @@ enum object_type {
  */
 #define PACK_SIGNATURE 0x5041434b	/* "PACK" */
 #define PACK_VERSION 2
+#define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
 struct pack_header {
 	unsigned int hdr_signature;
 	unsigned int hdr_version;
diff --git a/patch-delta.c b/patch-delta.c
index 98c27beb25..c0e1311435 100644
--- a/patch-delta.c
+++ b/patch-delta.c
@@ -44,16 +44,15 @@ void *patch_delta(void *src_buf, unsigned long src_size,
 		cmd = *data++;
 		if (cmd & 0x80) {
 			unsigned long cp_off = 0, cp_size = 0;
-			const unsigned char *buf;
 			if (cmd & 0x01) cp_off = *data++;
 			if (cmd & 0x02) cp_off |= (*data++ << 8);
 			if (cmd & 0x04) cp_off |= (*data++ << 16);
 			if (cmd & 0x08) cp_off |= (*data++ << 24);
 			if (cmd & 0x10) cp_size = *data++;
 			if (cmd & 0x20) cp_size |= (*data++ << 8);
+			if (cmd & 0x40) cp_size |= (*data++ << 16);
 			if (cp_size == 0) cp_size = 0x10000;
-			buf = (cmd & 0x40) ? dst_buf : src_buf;
-			memcpy(out, buf + cp_off, cp_size);
+			memcpy(out, src_buf + cp_off, cp_size);
 			out += cp_size;
 		} else {
 			memcpy(out, data, cmd);
diff --git a/unpack-objects.c b/unpack-objects.c
index 4b5b5cb3e2..815a1b382b 100644
--- a/unpack-objects.c
+++ b/unpack-objects.c
@@ -246,13 +246,12 @@ static void unpack_all(void)
 {
 	int i;
 	struct pack_header *hdr = fill(sizeof(struct pack_header));
-	unsigned version = ntohl(hdr->hdr_version);
 	unsigned nr_objects = ntohl(hdr->hdr_entries);
 
 	if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE)
 		die("bad pack file");
-	if (version != PACK_VERSION)
-		die("unable to handle pack file version %d", version);
+	if (!pack_version_ok(hdr->hdr_version))
+		die("unknown pack file version %d", ntohl(hdr->hdr_version));
 	fprintf(stderr, "Unpacking %d objects\n", nr_objects);
 
 	use(sizeof(struct pack_header));