diff --git a/midx.c b/midx.c
index ca98bfd7c6..67e0d64004 100644
--- a/midx.c
+++ b/midx.c
@@ -496,6 +496,7 @@ int nth_bitmapped_pack(struct repository *r, struct multi_pack_index *m,
 				 MIDX_CHUNK_BITMAPPED_PACKS_WIDTH * local_pack_int_id +
 				 sizeof(uint32_t));
 	bp->pack_int_id = pack_int_id;
+	bp->from_midx = m;
 
 	return 0;
 }
diff --git a/pack-bitmap.c b/pack-bitmap.c
index 2e657a2aa4..218d7ac2eb 100644
--- a/pack-bitmap.c
+++ b/pack-bitmap.c
@@ -2322,6 +2322,7 @@ void reuse_partial_packfile_from_bitmap(struct bitmap_index *bitmap_git,
 		packs[packs_nr].pack_int_id = pack_int_id;
 		packs[packs_nr].bitmap_nr = pack->num_objects;
 		packs[packs_nr].bitmap_pos = 0;
+		packs[packs_nr].from_midx = bitmap_git->midx;
 
 		objects_nr = packs[packs_nr++].bitmap_nr;
 	}
diff --git a/pack-bitmap.h b/pack-bitmap.h
index ff0fd815b8..d7f4b8b8e9 100644
--- a/pack-bitmap.h
+++ b/pack-bitmap.h
@@ -60,6 +60,7 @@ struct bitmapped_pack {
 	uint32_t bitmap_pos;
 	uint32_t bitmap_nr;
 
+	struct multi_pack_index *from_midx; /* MIDX only */
 	uint32_t pack_int_id; /* MIDX only */
 };