diff --git a/tsdb/block.go b/tsdb/block.go
index 8d7badef9e..44c6ef5053 100644
--- a/tsdb/block.go
+++ b/tsdb/block.go
@@ -189,6 +189,7 @@ type BlockMeta struct {
 // BlockStats contains stats about contents of a block.
 type BlockStats struct {
 	NumSamples          uint64 `json:"numSamples,omitempty"`
+	NumFloatSamples     uint64 `json:"numFloatSamples,omitempty"`
 	NumHistogramSamples uint64 `json:"numHistogramSamples,omitempty"`
 	NumSeries           uint64 `json:"numSeries,omitempty"`
 	NumChunks           uint64 `json:"numChunks,omitempty"`
diff --git a/tsdb/compact.go b/tsdb/compact.go
index c3d3770bff..517c42ff02 100644
--- a/tsdb/compact.go
+++ b/tsdb/compact.go
@@ -895,10 +895,13 @@ func (c DefaultBlockPopulator) PopulateBlock(ctx context.Context, metrics *Compa
 		meta.Stats.NumChunks += uint64(len(chks))
 		meta.Stats.NumSeries++
 		for _, chk := range chks {
-			meta.Stats.NumSamples += uint64(chk.Chunk.NumSamples())
-			enc := chk.Chunk.Encoding()
-			if enc == chunkenc.EncHistogram || enc == chunkenc.EncFloatHistogram {
-				meta.Stats.NumHistogramSamples += uint64(chk.Chunk.NumSamples())
+			samples := uint64(chk.Chunk.NumSamples())
+			meta.Stats.NumSamples += samples
+			switch chk.Chunk.Encoding() {
+			case chunkenc.EncHistogram, chunkenc.EncFloatHistogram:
+				meta.Stats.NumHistogramSamples += samples
+			case chunkenc.EncXOR:
+				meta.Stats.NumFloatSamples += samples
 			}
 		}
 
diff --git a/tsdb/compact_test.go b/tsdb/compact_test.go
index 4f376c2c1a..1ee08e3efb 100644
--- a/tsdb/compact_test.go
+++ b/tsdb/compact_test.go
@@ -1101,6 +1101,8 @@ func TestCompaction_populateBlock(t *testing.T) {
 					for _, smpl := range chk {
 						if smpl.h != nil || smpl.fh != nil {
 							s.NumHistogramSamples++
+						} else {
+							s.NumFloatSamples++
 						}
 					}
 				}