diff --git a/types/metadata.go b/types/metadata.go
index 830d484..7ffecb4 100644
--- a/types/metadata.go
+++ b/types/metadata.go
@@ -2,7 +2,6 @@ package types
 
 import (
 	"encoding/json"
-
 	"github.com/huandu/xstrings"
 	"github.com/itering/scale.go/types/convert"
 	"github.com/itering/scale.go/types/scaleBytes"
@@ -740,6 +739,7 @@ type MetadataModuleError struct {
 	Name         string             `json:"name"`
 	Doc          []string           `json:"doc"`
 	Fields       []ModuleErrorField `json:"fields,omitempty"`
+	Index        int                `json:"index,omitempty"`
 }
 
 type ModuleErrorField struct {
diff --git a/types/v14.go b/types/v14.go
index 16e3cf5..7391e63 100644
--- a/types/v14.go
+++ b/types/v14.go
@@ -110,6 +110,7 @@ func (m *MetadataV14Decoder) Process() {
 
 			for _, variant := range variants.Variants {
 				moduleErr := MetadataModuleError{Name: variant.Name, Doc: variant.Docs}
+				moduleErr.Index = variant.Index
 				for _, field := range variant.Fields {
 					moduleErr.Fields = append(moduleErr.Fields, ModuleErrorField{Doc: field.Docs, TypeName: field.TypeName, Type: metadataSiType[field.Type]})
 				}