diff --git a/lib/mergeset/block_stream_reader.go b/lib/mergeset/block_stream_reader.go
index 83d0fc5ed..a48bbe9c4 100644
--- a/lib/mergeset/block_stream_reader.go
+++ b/lib/mergeset/block_stream_reader.go
@@ -98,20 +98,20 @@ func (bsr *blockStreamReader) String() string {
 	return bsr.ph.String()
 }
 
-// InitFromInmemoryPart initializes bsr from the given ip.
-func (bsr *blockStreamReader) InitFromInmemoryPart(ip *inmemoryPart) {
+// InitFromInmemoryPart initializes bsr from the given mp.
+func (bsr *blockStreamReader) InitFromInmemoryPart(mp *inmemoryPart) {
 	bsr.reset()
 
 	var err error
-	bsr.mrs, err = unmarshalMetaindexRows(bsr.mrs[:0], ip.metaindexData.NewReader())
+	bsr.mrs, err = unmarshalMetaindexRows(bsr.mrs[:0], mp.metaindexData.NewReader())
 	if err != nil {
 		logger.Panicf("BUG: cannot unmarshal metaindex rows from inmemory part: %s", err)
 	}
 
-	bsr.ph.CopyFrom(&ip.ph)
-	bsr.indexReader = ip.indexData.NewReader()
-	bsr.itemsReader = ip.itemsData.NewReader()
-	bsr.lensReader = ip.lensData.NewReader()
+	bsr.ph.CopyFrom(&mp.ph)
+	bsr.indexReader = mp.indexData.NewReader()
+	bsr.itemsReader = mp.itemsData.NewReader()
+	bsr.lensReader = mp.lensData.NewReader()
 
 	if bsr.ph.itemsCount <= 0 {
 		logger.Panicf("BUG: source inmemoryPart must contain at least a single item")
diff --git a/lib/mergeset/block_stream_writer.go b/lib/mergeset/block_stream_writer.go
index 205da28f6..46bac85a6 100644
--- a/lib/mergeset/block_stream_writer.go
+++ b/lib/mergeset/block_stream_writer.go
@@ -63,17 +63,17 @@ func (bsw *blockStreamWriter) reset() {
 	bsw.mrFirstItemCaught = false
 }
 
-func (bsw *blockStreamWriter) InitFromInmemoryPart(ip *inmemoryPart) {
+func (bsw *blockStreamWriter) InitFromInmemoryPart(mp *inmemoryPart) {
 	bsw.reset()
 
 	// Use the minimum compression level for in-memory blocks,
 	// since they are going to be re-compressed during the merge into file-based blocks.
 	bsw.compressLevel = -5 // See https://github.com/facebook/zstd/releases/tag/v1.3.4
 
-	bsw.metaindexWriter = &ip.metaindexData
-	bsw.indexWriter = &ip.indexData
-	bsw.itemsWriter = &ip.itemsData
-	bsw.lensWriter = &ip.lensData
+	bsw.metaindexWriter = &mp.metaindexData
+	bsw.indexWriter = &mp.indexData
+	bsw.itemsWriter = &mp.itemsData
+	bsw.lensWriter = &mp.lensData
 }
 
 // InitFromFilePart initializes bsw from a file-based part on the given path.