diff --git a/cmd/khepri/cmd_backup.go b/cmd/khepri/cmd_backup.go
index 6785d12be..1b4d80988 100644
--- a/cmd/khepri/cmd_backup.go
+++ b/cmd/khepri/cmd_backup.go
@@ -125,7 +125,7 @@ func commandBackup(repo *khepri.Repository, args []string) error {
 	}
 
 	sn := khepri.NewSnapshot(target)
-	sn.Tree = id
+	sn.TreeID = id
 	snid, err := sn.Save(repo)
 
 	if err != nil {
diff --git a/cmd/khepri/cmd_restore.go b/cmd/khepri/cmd_restore.go
index 0aef4bedc..fe8adbd09 100644
--- a/cmd/khepri/cmd_restore.go
+++ b/cmd/khepri/cmd_restore.go
@@ -127,7 +127,7 @@ func commandRestore(repo *khepri.Repository, args []string) error {
 		log.Fatalf("error loading snapshot %s", id)
 	}
 
-	err = restore_dir(repo, sn.Tree, target)
+	err = restore_dir(repo, sn.TreeID, target)
 	if err != nil {
 		return err
 	}
diff --git a/snapshot.go b/snapshot.go
index 514e29cfe..555ebcf1e 100644
--- a/snapshot.go
+++ b/snapshot.go
@@ -9,7 +9,7 @@ import (
 
 type Snapshot struct {
 	Time     time.Time `json:"time"`
-	Tree     ID        `json:"tree"`
+	TreeID   ID        `json:"tree"`
 	Dir      string    `json:"dir"`
 	Hostname string    `json:"hostname,omitempty"`
 	Username string    `json:"username,omitempty"`
@@ -39,7 +39,7 @@ func NewSnapshot(dir string) *Snapshot {
 }
 
 func (sn *Snapshot) Save(repo *Repository) (ID, error) {
-	if sn.Tree == nil {
+	if sn.TreeID == nil {
 		panic("Snapshot.Save() called with nil tree id")
 	}
 
diff --git a/snapshot_test.go b/snapshot_test.go
index 611f9512f..c294312d7 100644
--- a/snapshot_test.go
+++ b/snapshot_test.go
@@ -17,7 +17,7 @@ func TestSnapshot(t *testing.T) {
 	}()
 
 	sn := khepri.NewSnapshot("/home/foobar")
-	sn.Tree, err = khepri.ParseID("c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2")
+	sn.TreeID, err = khepri.ParseID("c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2")
 	ok(t, err)
 	sn.Time, err = time.Parse(time.RFC3339Nano, "2014-08-03T17:49:05.378595539+02:00")
 	ok(t, err)