diff --git a/chunkenc/xor.go b/chunkenc/xor.go
index b3f5b5135..ff690f222 100644
--- a/chunkenc/xor.go
+++ b/chunkenc/xor.go
@@ -89,7 +89,6 @@ func (c *XORChunk) Appender() (Appender, error) {
 	}
 
 	a := &xorAppender{
-		c:        c,
 		b:        c.b,
 		t:        it.t,
 		v:        it.val,
@@ -119,7 +118,6 @@ func (c *XORChunk) Iterator() Iterator {
 }
 
 type xorAppender struct {
-	c *XORChunk
 	b *bstream
 
 	t      int64