diff --git a/pkg/obiseq/language.go b/pkg/obiseq/language.go
index 4738274..949082b 100644
--- a/pkg/obiseq/language.go
+++ b/pkg/obiseq/language.go
@@ -141,14 +141,14 @@ var OBILang = gval.NewLanguage(
 	gval.Function("max", func(args ...interface{}) (interface{}, error) {
 		return obiutils.Max(args[0])
 	}),
-	gval.Function("which_max", func(args ...interface{}) (interface{}, error) {
+	gval.Function("whichmax", func(args ...interface{}) (interface{}, error) {
 		result, err := obiutils.WhichMax(args[0])
 		if idx, ok := result.(int); ok {
 			return float64(idx), nil
 		}
 		return result, err
 	}),
-	gval.Function("which_min", func(args ...interface{}) (interface{}, error) {
+	gval.Function("whichmin", func(args ...interface{}) (interface{}, error) {
 		result, err := obiutils.WhichMin(args[0])
 		if idx, ok := result.(int); ok {
 			return float64(idx), nil