diff --git a/codec/codec.go b/codec/codec.go
index 8c7e8eda1fe..1620887c09a 100644
--- a/codec/codec.go
+++ b/codec/codec.go
@@ -172,8 +172,8 @@ func FromBytes(buf []byte) *sroar.Bitmap {
 }
 
 func FromBackup(buf []byte) *sroar.Bitmap {
-	r := sroar.NewBitmap()
 	var prev uint64
+	var uids []uint64
 	for len(buf) > 0 {
 		uid, n := binary.Uvarint(buf)
 		if uid == 0 {
@@ -182,14 +182,14 @@ func FromBackup(buf []byte) *sroar.Bitmap {
 		buf = buf[n:]
 
 		next := prev + uid
-		r.Set(next)
+		uids = append(uids, next)
 		prev = next
 	}
-	return r
+	return sroar.FromSortedList(uids)
 }
 
 func ToUids(plist *pb.PostingList, start uint64) []uint64 {
-	r := sroar.FromBuffer(plist.Bitmap)
+	r := sroar.FromBufferWithCopy(plist.Bitmap)
 	r.RemoveRange(0, start)
 	return r.ToArray()
 }
diff --git a/go.mod b/go.mod
index 1c0d20e93f7..05b6226fe13 100644
--- a/go.mod
+++ b/go.mod
@@ -26,7 +26,7 @@ require (
 	github.com/dgraph-io/graphql-transport-ws v0.0.0-20210511143556-2cef522f1f15
 	github.com/dgraph-io/ristretto v0.1.0
 	github.com/dgraph-io/simdjson-go v0.3.0
-	github.com/dgraph-io/sroar v0.0.0-20210604145002-865050cb7465
+	github.com/dgraph-io/sroar v0.0.0-20210810060359-2dcd866b0b1f
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1
 	github.com/dgryski/go-farm v0.0.0-20200201041132-a6ae2369ad13
diff --git a/go.sum b/go.sum
index c97f0f5e300..5a11da16462 100644
--- a/go.sum
+++ b/go.sum
@@ -182,8 +182,8 @@ github.com/dgraph-io/ristretto v0.1.0 h1:Jv3CGQHp9OjuMBSne1485aDpUkTKEcUqF+jm/Lu
 github.com/dgraph-io/ristretto v0.1.0/go.mod h1:fux0lOrBhrVCJd3lcTHsIJhq1T2rokOu6v9Vcb3Q9ug=
 github.com/dgraph-io/simdjson-go v0.3.0 h1:h71LO7vR4LHMPUhuoGN8bqGm1VNfGOlAG8BI6iDUKw0=
 github.com/dgraph-io/simdjson-go v0.3.0/go.mod h1:Otpysdjaxj9OGaJusn4pgQV7OFh2bELuHANq0I78uvY=
-github.com/dgraph-io/sroar v0.0.0-20210604145002-865050cb7465 h1:wj9EEeLJyJnopcmtJlw5TzOcEgudIYLWGDE3cBpYUBQ=
-github.com/dgraph-io/sroar v0.0.0-20210604145002-865050cb7465/go.mod h1:bdNPtQmcxoIQVkZEWZvX0n0/IDlHFab397xdBlP4OoE=
+github.com/dgraph-io/sroar v0.0.0-20210810060359-2dcd866b0b1f h1:t0+mRMDoMgWykf89mPKW9RaeFb3ujM7HoISogMXsaDo=
+github.com/dgraph-io/sroar v0.0.0-20210810060359-2dcd866b0b1f/go.mod h1:bdNPtQmcxoIQVkZEWZvX0n0/IDlHFab397xdBlP4OoE=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1 h1:CaO/zOnF8VvUfEbhRatPcwKVWamvbYd8tQGRWacE9kU=
diff --git a/posting/list.go b/posting/list.go
index e085f52d6be..10843d07463 100644
--- a/posting/list.go
+++ b/posting/list.go
@@ -520,7 +520,7 @@ func (l *List) bitmap(opt ListOptions) (*sroar.Bitmap, error) {
 	}
 	r := sroar.NewBitmap()
 	if deleteBelow == 0 {
-		r = sroar.FromBuffer(l.plist.Bitmap)
+		r = sroar.FromBufferWithCopy(l.plist.Bitmap)
 		if iw != nil {
 			r.And(iw)
 		}
@@ -533,7 +533,7 @@ func (l *List) bitmap(opt ListOptions) (*sroar.Bitmap, error) {
 			if err != nil {
 				return nil, errors.Wrapf(err, "while reading a split with startUid: %d", startUid)
 			}
-			s := sroar.FromBuffer(split.Bitmap)
+			s := sroar.FromBufferWithCopy(split.Bitmap)
 
 			// Intersect with opt.Intersect.
 			if iw != nil {