diff --git a/pkg/obioptions/version.go b/pkg/obioptions/version.go
index fc42c56..cfe9ddd 100644
--- a/pkg/obioptions/version.go
+++ b/pkg/obioptions/version.go
@@ -8,7 +8,7 @@ import (
 // corresponds to the last commit, and not the one when the file will be
 // commited
 
-var _Commit = "27204d5"
+var _Commit = "961abce"
 var _Version = "Release 4.4.0"
 
 // Version returns the version of the obitools package.
diff --git a/pkg/obiseq/attributes.go b/pkg/obiseq/attributes.go
index 8a9ebc9..dd4699f 100644
--- a/pkg/obiseq/attributes.go
+++ b/pkg/obiseq/attributes.go
@@ -21,7 +21,7 @@ func (s *BioSequence) AttributeKeys(skip_container, skip_definition bool) obiuti
 	keys := obiutils.MakeSet[string]()
 
 	for k, v := range s.Annotations() {
-		if !((skip_container && obiutils.IsAContainer(v)) ||
+		if !((skip_container && (obiutils.IsAContainer(v) || IsStatsOnValues(v))) ||
 			(skip_definition && k == "definition")) {
 			keys.Add(k)
 		}
diff --git a/pkg/obiseq/merge.go b/pkg/obiseq/merge.go
index 5fb9d67..11f4ce5 100644
--- a/pkg/obiseq/merge.go
+++ b/pkg/obiseq/merge.go
@@ -76,6 +76,12 @@ func MapAsStatsOnValues(m map[string]int) *StatsOnValues {
 	return &v
 
 }
+
+func IsStatsOnValues(value interface{}) bool {
+	_, ok := value.(*StatsOnValues)
+	return ok
+}
+
 func (sov *StatsOnValues) RLock() {
 	sov.lock.RLock()
 }