diff --git a/boltdb/attrstore.go b/boltdb/attrstore.go
index 40d478f3a..3849e0964 100644
--- a/boltdb/attrstore.go
+++ b/boltdb/attrstore.go
@@ -63,8 +63,8 @@ func (c *attrCache) Set(id uint64, attrs map[string]interface{}) {
 	c.attrs[id] = attrs
 }
 
-// AttrStore represents a storage layer for attributes.
-type AttrStore struct {
+// attrStore represents a storage layer for attributes.
+type attrStore struct {
 	mu        sync.RWMutex
 	path      string
 	db        *bolt.DB
@@ -80,17 +80,17 @@ func NewAttrCache() *attrCache {
 
 // NewAttrStore returns a new instance of AttrStore.
 func NewAttrStore(path string) pilosa.AttrStore {
-	return &AttrStore{
+	return &attrStore{
 		path:      path,
 		attrCache: NewAttrCache(),
 	}
 }
 
 // Path returns path to the store's data file.
-func (s *AttrStore) Path() string { return s.path }
+func (s *attrStore) Path() string { return s.path }
 
 // Open opens and initializes the store.
-func (s *AttrStore) Open() error {
+func (s *attrStore) Open() error {
 	// Open storage.
 	db, err := bolt.Open(s.path, 0666, &bolt.Options{Timeout: 1 * time.Second})
 	if err != nil {
@@ -112,7 +112,7 @@ func (s *AttrStore) Open() error {
 }
 
 // Close closes the store.
-func (s *AttrStore) Close() error {
+func (s *attrStore) Close() error {
 	if s.db != nil {
 		s.db.Close()
 	}
@@ -120,7 +120,7 @@ func (s *AttrStore) Close() error {
 }
 
 // Attrs returns a set of attributes by ID.
-func (s *AttrStore) Attrs(id uint64) (m map[string]interface{}, err error) {
+func (s *attrStore) Attrs(id uint64) (m map[string]interface{}, err error) {
 	s.mu.RLock()
 	defer s.mu.RUnlock()
 
@@ -147,7 +147,7 @@ func (s *AttrStore) Attrs(id uint64) (m map[string]interface{}, err error) {
 }
 
 // SetAttrs sets attribute values for a given ID.
-func (s *AttrStore) SetAttrs(id uint64, m map[string]interface{}) error {
+func (s *attrStore) SetAttrs(id uint64, m map[string]interface{}) error {
 	// Ignore empty maps.
 	if len(m) == 0 {
 		return nil
@@ -184,7 +184,7 @@ func (s *AttrStore) SetAttrs(id uint64, m map[string]interface{}) error {
 }
 
 // SetBulkAttrs sets attribute values for a set of ids.
-func (s *AttrStore) SetBulkAttrs(m map[uint64]map[string]interface{}) error {
+func (s *attrStore) SetBulkAttrs(m map[uint64]map[string]interface{}) error {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
@@ -220,7 +220,7 @@ func (s *AttrStore) SetBulkAttrs(m map[uint64]map[string]interface{}) error {
 }
 
 // Blocks returns a list of all blocks in the store.
-func (s *AttrStore) Blocks() ([]pilosa.AttrBlock, error) {
+func (s *attrStore) Blocks() ([]pilosa.AttrBlock, error) {
 	tx, err := s.db.Begin(false)
 	if err != nil {
 		return nil, errors.Wrap(err, "starting transaction")
@@ -251,7 +251,7 @@ func (s *AttrStore) Blocks() ([]pilosa.AttrBlock, error) {
 }
 
 // BlockData returns all data for a single block.
-func (s *AttrStore) BlockData(i uint64) (map[uint64]map[string]interface{}, error) {
+func (s *attrStore) BlockData(i uint64) (map[uint64]map[string]interface{}, error) {
 	m := make(map[uint64]map[string]interface{})
 
 	// Start read-only transaction.