diff --git a/db.go b/db.go
index 65feea4..fafdb62 100644
--- a/db.go
+++ b/db.go
@@ -1625,7 +1625,7 @@ func restoreWAL(ctx context.Context, r Replica, generation string, index int, db
 // unable to checkpoint during this time.
 //
 // If dst is set, the database file is copied to that location before checksum.
-func (db *DB) CRC64(dst string) (uint64, Pos, error) {
+func (db *DB) CRC64() (uint64, Pos, error) {
 	db.mu.Lock()
 	defer db.mu.Unlock()
 
@@ -1655,16 +1655,7 @@ func (db *DB) CRC64(dst string) (uint64, Pos, error) {
 	}
 	pos.Offset = 0
 
-	// Copy file, if dst specified.
-	checksumPath := db.Path()
-	if dst != "" {
-		if err := copyFile(dst, db.Path()); err != nil {
-			return 0, Pos{}, err
-		}
-		checksumPath = dst
-	}
-
-	chksum, err := checksumFile(checksumPath)
+	chksum, err := checksumFile(db.Path())
 	if err != nil {
 		return 0, pos, err
 	}
diff --git a/db_test.go b/db_test.go
index 717682d..7227cfb 100644
--- a/db_test.go
+++ b/db_test.go
@@ -118,7 +118,7 @@ func TestDB_CRC64(t *testing.T) {
 	t.Run("ErrNotExist", func(t *testing.T) {
 		db := MustOpenDB(t)
 		defer MustCloseDB(t, db)
-		if _, _, err := db.CRC64(""); !os.IsNotExist(err) {
+		if _, _, err := db.CRC64(); !os.IsNotExist(err) {
 			t.Fatalf("unexpected error: %#v", err)
 		}
 	})
@@ -131,7 +131,7 @@ func TestDB_CRC64(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		chksum0, _, err := db.CRC64("")
+		chksum0, _, err := db.CRC64()
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -139,7 +139,7 @@ func TestDB_CRC64(t *testing.T) {
 		// Issue change that is applied to the WAL. Checksum should not change.
 		if _, err := sqldb.Exec(`CREATE TABLE t (id INT);`); err != nil {
 			t.Fatal(err)
-		} else if chksum1, _, err := db.CRC64(""); err != nil {
+		} else if chksum1, _, err := db.CRC64(); err != nil {
 			t.Fatal(err)
 		} else if chksum0 == chksum1 {
 			t.Fatal("expected different checksum event after WAL change")
@@ -150,7 +150,7 @@ func TestDB_CRC64(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		if chksum2, _, err := db.CRC64(""); err != nil {
+		if chksum2, _, err := db.CRC64(); err != nil {
 			t.Fatal(err)
 		} else if chksum0 == chksum2 {
 			t.Fatal("expected different checksums after checkpoint")
diff --git a/replica.go b/replica.go
index f9b2726..6ae8f3b 100644
--- a/replica.go
+++ b/replica.go
@@ -1049,11 +1049,12 @@ func ValidateReplica(ctx context.Context, r Replica) error {
 	if err != nil {
 		return err
 	}
+	defer os.RemoveAll(tmpdir)
 
 	// Compute checksum of primary database under lock. This prevents a
 	// sync from occurring and the database will not be written.
 	primaryPath := filepath.Join(tmpdir, "primary")
-	chksum0, pos, err := db.CRC64(primaryPath)
+	chksum0, pos, err := db.CRC64()
 	if err != nil {
 		return fmt.Errorf("cannot compute checksum: %w", err)
 	}