diff --git a/tsdb/head_append.go b/tsdb/head_append.go
index a77c8a4eb..3d828d066 100644
--- a/tsdb/head_append.go
+++ b/tsdb/head_append.go
@@ -1134,7 +1134,7 @@ type chunkOpts struct {
 // isolation for this append.)
 // It is unsafe to call this concurrently with s.iterator(...) without holding the series lock.
 func (s *memSeries) append(t int64, v float64, appendID uint64, o chunkOpts) (sampleInOrder, chunkCreated bool) {
-	c, sampleInOrder, chunkCreated := s.appendPreprocessor(t, chunkenc.EncXOR, o.chunkDiskMapper, o.chunkRange, o.samplesPerChunk)
+	c, sampleInOrder, chunkCreated := s.appendPreprocessor(t, chunkenc.EncXOR, o)
 	if !sampleInOrder {
 		return sampleInOrder, chunkCreated
 	}
@@ -1168,7 +1168,7 @@ func (s *memSeries) appendHistogram(t int64, h *histogram.Histogram, appendID ui
 		pMergedSpans, nMergedSpans         []histogram.Span
 		okToAppend, counterReset, gauge    bool
 	)
-	c, sampleInOrder, chunkCreated := s.appendPreprocessor(t, chunkenc.EncHistogram, o.chunkDiskMapper, o.chunkRange, o.samplesPerChunk)
+	c, sampleInOrder, chunkCreated := s.appendPreprocessor(t, chunkenc.EncHistogram, o)
 	if !sampleInOrder {
 		return sampleInOrder, chunkCreated
 	}
@@ -1262,7 +1262,7 @@ func (s *memSeries) appendFloatHistogram(t int64, fh *histogram.FloatHistogram,
 		pMergedSpans, nMergedSpans         []histogram.Span
 		okToAppend, counterReset, gauge    bool
 	)
-	c, sampleInOrder, chunkCreated := s.appendPreprocessor(t, chunkenc.EncFloatHistogram, o.chunkDiskMapper, o.chunkRange, o.samplesPerChunk)
+	c, sampleInOrder, chunkCreated := s.appendPreprocessor(t, chunkenc.EncFloatHistogram, o)
 	if !sampleInOrder {
 		return sampleInOrder, chunkCreated
 	}
@@ -1344,9 +1344,7 @@ func (s *memSeries) appendFloatHistogram(t int64, fh *histogram.FloatHistogram,
 // appendPreprocessor takes care of cutting new chunks and m-mapping old chunks.
 // It is unsafe to call this concurrently with s.iterator(...) without holding the series lock.
 // This should be called only when appending data.
-func (s *memSeries) appendPreprocessor(
-	t int64, e chunkenc.Encoding, chunkDiskMapper *chunks.ChunkDiskMapper, chunkRange int64, samplesPerChunk int,
-) (c *memChunk, sampleInOrder, chunkCreated bool) {
+func (s *memSeries) appendPreprocessor(t int64, e chunkenc.Encoding, o chunkOpts) (c *memChunk, sampleInOrder, chunkCreated bool) {
 	c = s.head()
 
 	if c == nil {
@@ -1355,7 +1353,7 @@ func (s *memSeries) appendPreprocessor(
 			return c, false, false
 		}
 		// There is no head chunk in this series yet, create the first chunk for the sample.
-		c = s.cutNewHeadChunk(t, e, chunkDiskMapper, chunkRange)
+		c = s.cutNewHeadChunk(t, e, o.chunkDiskMapper, o.chunkRange)
 		chunkCreated = true
 	}
 
@@ -1367,7 +1365,7 @@ func (s *memSeries) appendPreprocessor(
 	if c.chunk.Encoding() != e {
 		// The chunk encoding expected by this append is different than the head chunk's
 		// encoding. So we cut a new chunk with the expected encoding.
-		c = s.cutNewHeadChunk(t, e, chunkDiskMapper, chunkRange)
+		c = s.cutNewHeadChunk(t, e, o.chunkDiskMapper, o.chunkRange)
 		chunkCreated = true
 	}
 
@@ -1376,14 +1374,14 @@ func (s *memSeries) appendPreprocessor(
 		// It could be the new chunk created after reading the chunk snapshot,
 		// hence we fix the minTime of the chunk here.
 		c.minTime = t
-		s.nextAt = rangeForTimestamp(c.minTime, chunkRange)
+		s.nextAt = rangeForTimestamp(c.minTime, o.chunkRange)
 	}
 
 	// If we reach 25% of a chunk's desired sample count, predict an end time
 	// for this chunk that will try to make samples equally distributed within
 	// the remaining chunks in the current chunk range.
 	// At latest it must happen at the timestamp set when the chunk was cut.
-	if numSamples == samplesPerChunk/4 {
+	if numSamples == o.samplesPerChunk/4 {
 		s.nextAt = computeChunkEndTime(c.minTime, c.maxTime, s.nextAt)
 	}
 	// If numSamples > samplesPerChunk*2 then our previous prediction was invalid,
@@ -1391,8 +1389,8 @@ func (s *memSeries) appendPreprocessor(
 	// Since we assume that the rate is higher, we're being conservative and cutting at 2*samplesPerChunk
 	// as we expect more chunks to come.
 	// Note that next chunk will have its nextAt recalculated for the new rate.
-	if t >= s.nextAt || numSamples >= samplesPerChunk*2 {
-		c = s.cutNewHeadChunk(t, e, chunkDiskMapper, chunkRange)
+	if t >= s.nextAt || numSamples >= o.samplesPerChunk*2 {
+		c = s.cutNewHeadChunk(t, e, o.chunkDiskMapper, o.chunkRange)
 		chunkCreated = true
 	}