diff --git a/pack-bitmap-write.c b/pack-bitmap-write.c
index 86ed6a5d78..1c8070f99c 100644
--- a/pack-bitmap-write.c
+++ b/pack-bitmap-write.c
@@ -877,7 +877,7 @@ static void write_pseudo_merges(struct bitmap_writer *writer,
 
 	next_ext = st_add(hashfile_total(f),
 			  st_mult(kh_size(writer->pseudo_merge_commits),
-				  sizeof(uint64_t)));
+				  sizeof(uint32_t) + sizeof(uint64_t)));
 
 	table_start = hashfile_total(f);
 
diff --git a/pseudo-merge.c b/pseudo-merge.c
index fb71c76179..34e1da00b4 100644
--- a/pseudo-merge.c
+++ b/pseudo-merge.c
@@ -600,7 +600,7 @@ static int nth_pseudo_merge_ext(const struct pseudo_merge_map *pm,
 		return error(_("out-of-bounds read: (%"PRIuMAX" >= %"PRIuMAX")"),
 			     (uintmax_t)ofs, (uintmax_t)pm->map_size);
 
-	read_pseudo_merge_commit_at(merge, pm->map + ofs);
+	merge->pseudo_merge_ofs = ofs;
 
 	return 0;
 }
@@ -671,7 +671,7 @@ int apply_pseudo_merges_for_commit(const struct pseudo_merge_map *pm,
 		off_t ofs = merge_commit.pseudo_merge_ofs & ~((uint64_t)1<<63);
 		uint32_t i;
 
-		if (pseudo_merge_ext_at(pm, &ext, ofs) < -1) {
+		if (pseudo_merge_ext_at(pm, &ext, ofs) < 0) {
 			warning(_("could not read extended pseudo-merge table "
 				  "for commit %s"),
 				oid_to_hex(&commit->object.oid));
diff --git a/t/t5333-pseudo-merge-bitmaps.sh b/t/t5333-pseudo-merge-bitmaps.sh
index 5411fbf1e0..90459da5e6 100755
--- a/t/t5333-pseudo-merge-bitmaps.sh
+++ b/t/t5333-pseudo-merge-bitmaps.sh
@@ -549,7 +549,7 @@ test_expect_success 'apply pseudo-merges from multiple groups during fill-in' '
 	)
 '
 
-test_expect_failure 'apply pseudo-merges with overlapping groups during fill-in' '
+test_expect_success 'apply pseudo-merges with overlapping groups during fill-in' '
 	test_when_finished "rm -fr pseudo-merge-fill-in-overlap" &&
 	git init pseudo-merge-fill-in-overlap &&
 	(