diff --git a/index/scorch/segment/zap/build.go b/index/scorch/segment/zap/build.go
index 4edd277d..eec9998b 100644
--- a/index/scorch/segment/zap/build.go
+++ b/index/scorch/segment/zap/build.go
@@ -308,7 +308,7 @@ func persistStoredFieldValues(fieldID int,
 }
 
 func persistPostingDetails(memSegment *mem.Segment, w *CountHashWriter, chunkFactor uint32) ([]uint64, []uint64, error) {
-	var freqOffsets, locOfffsets []uint64
+	freqOffsets := make([]uint64, 0, len(memSegment.Postings))
 	tfEncoder := newChunkedIntCoder(uint64(chunkFactor), uint64(len(memSegment.Stored)-1))
 	for postingID := range memSegment.Postings {
 		if postingID != 0 {
@@ -351,6 +351,7 @@ func persistPostingDetails(memSegment *mem.Segment, w *CountHashWriter, chunkFac
 	}
 
 	// now do it again for the locations
+	locOffsets := make([]uint64, 0, len(memSegment.Postings))
 	locEncoder := newChunkedIntCoder(uint64(chunkFactor), uint64(len(memSegment.Stored)-1))
 	for postingID := range memSegment.Postings {
 		if postingID != 0 {
@@ -414,14 +415,15 @@ func persistPostingDetails(memSegment *mem.Segment, w *CountHashWriter, chunkFac
 		}
 
 		// record where this postings loc info starts
-		locOfffsets = append(locOfffsets, uint64(w.Count()))
+		locOffsets = append(locOffsets, uint64(w.Count()))
 		locEncoder.Close()
 		_, err := locEncoder.Write(w)
 		if err != nil {
 			return nil, nil, err
 		}
 	}
-	return freqOffsets, locOfffsets, nil
+
+	return freqOffsets, locOffsets, nil
 }
 
 func persistPostingsLocs(memSegment *mem.Segment, w *CountHashWriter) (rv []uint64, err error) {