diff --git a/datastore.go b/datastore.go
index f534da9..78cc5da 100644
--- a/datastore.go
+++ b/datastore.go
@@ -95,6 +95,10 @@ func (a *accessor) Has(key ds.Key) (exists bool, err error) {
 	return a.ldb.Has(key.Bytes(), nil)
 }
 
+func (d *accessor) GetSize(key ds.Key) (size int, err error) {
+	return ds.GetBackedSize(d, key)
+}
+
 func (a *accessor) Delete(key ds.Key) (err error) {
 	// leveldb Delete will not return an error if the key doesn't
 	// exist (see https://github.com/syndtr/goleveldb/issues/109),
diff --git a/ds_test.go b/ds_test.go
index b7cc2c6..98a7c8b 100644
--- a/ds_test.go
+++ b/ds_test.go
@@ -9,6 +9,7 @@ import (
 
 	ds "github.com/ipfs/go-datastore"
 	dsq "github.com/ipfs/go-datastore/query"
+	dstest "github.com/ipfs/go-datastore/test"
 )
 
 var testcases = map[string]string{
@@ -320,3 +321,9 @@ func TestTransactionManyOperations(t *testing.T) {
 
 	txn.Discard()
 }
+
+func TestSuite(t *testing.T) {
+	d := newDSMem(t)
+	defer d.Close()
+	dstest.SubtestAll(t, d)
+}
diff --git a/package.json b/package.json
index bbce025..7bc0820 100644
--- a/package.json
+++ b/package.json
@@ -21,9 +21,9 @@
     },
     {
       "author": "jbenet",
-      "hash": "QmbQshXLNcCPRUGZv4sBGxnZNAHREA6MKeomkwihNXPZWP",
+      "hash": "QmaRb5yNXKonhbkpNxNawoydk4N6es6b4fPj19sjEKsh5D",
       "name": "go-datastore",
-      "version": "3.3.0"
+      "version": "3.4.0"
     }
   ],
   "gxVersion": "0.8.0",