diff --git a/object-file-convert.c b/object-file-convert.c
index 79e8e211ff..0da081104e 100644
--- a/object-file-convert.c
+++ b/object-file-convert.c
@@ -136,6 +136,48 @@ static int convert_tag_object(struct strbuf *out,
 	return 0;
 }
 
+static int convert_commit_object(struct strbuf *out,
+				 const struct git_hash_algo *from,
+				 const struct git_hash_algo *to,
+				 const char *buffer, size_t size)
+{
+	const char *tail = buffer;
+	const char *bufptr = buffer;
+	const int tree_entry_len = from->hexsz + 5;
+	const int parent_entry_len = from->hexsz + 7;
+	struct object_id oid, mapped_oid;
+	const char *p;
+
+	tail += size;
+	if (tail <= bufptr + tree_entry_len + 1 || memcmp(bufptr, "tree ", 5) ||
+			bufptr[tree_entry_len] != '\n')
+		return error("bogus commit object");
+	if (parse_oid_hex_algop(bufptr + 5, &oid, &p, from) < 0)
+		return error("bad tree pointer");
+
+	if (repo_oid_to_algop(the_repository, &oid, to, &mapped_oid))
+		return error("unable to map tree %s in commit object",
+			     oid_to_hex(&oid));
+	strbuf_addf(out, "tree %s\n", oid_to_hex(&mapped_oid));
+	bufptr = p + 1;
+
+	while (bufptr + parent_entry_len < tail && !memcmp(bufptr, "parent ", 7)) {
+		if (tail <= bufptr + parent_entry_len + 1 ||
+		    parse_oid_hex_algop(bufptr + 7, &oid, &p, from) ||
+		    *p != '\n')
+			return error("bad parents in commit");
+
+		if (repo_oid_to_algop(the_repository, &oid, to, &mapped_oid))
+			return error("unable to map parent %s in commit object",
+				     oid_to_hex(&oid));
+
+		strbuf_addf(out, "parent %s\n", oid_to_hex(&mapped_oid));
+		bufptr = p + 1;
+	}
+	strbuf_add(out, bufptr, tail - bufptr);
+	return 0;
+}
+
 int convert_object_file(struct strbuf *outbuf,
 			const struct git_hash_algo *from,
 			const struct git_hash_algo *to,
@@ -150,13 +192,15 @@ int convert_object_file(struct strbuf *outbuf,
 		BUG("Refusing noop object file conversion");
 
 	switch (type) {
+	case OBJ_COMMIT:
+		ret = convert_commit_object(outbuf, from, to, buf, len);
+		break;
 	case OBJ_TREE:
 		ret = convert_tree_object(outbuf, from, to, buf, len);
 		break;
 	case OBJ_TAG:
 		ret = convert_tag_object(outbuf, from, to, buf, len);
 		break;
-	case OBJ_COMMIT:
 	default:
 		/* Not implemented yet, so fail. */
 		ret = -1;