diff --git a/pkg/obioptions/version.go b/pkg/obioptions/version.go
index c4d4a1a..b326b22 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 = "7a6d552"
+var _Commit = "6d204f6"
 var _Version = "Release 4.4.0"
 
 // Version returns the version of the obitools package.
diff --git a/pkg/obitools/obiannotate/obiannotate.go b/pkg/obitools/obiannotate/obiannotate.go
index 9368aaa..8c410d9 100644
--- a/pkg/obitools/obiannotate/obiannotate.go
+++ b/pkg/obitools/obiannotate/obiannotate.go
@@ -194,11 +194,7 @@ func EvalAttributeWorker(expression map[string]string) obiseq.SeqWorker {
 	w = nil
 
 	for a, e := range expression {
-		if w == nil {
-			w = obiseq.EditAttributeWorker(a, e)
-		} else {
-			w.ChainWorkers(obiseq.EditAttributeWorker(a, e))
-		}
+		w = w.ChainWorkers(obiseq.EditAttributeWorker(a, e))
 	}
 
 	return w