diff --git a/generator/ast/transform/index.go b/generator/ast/transform/index.go
index f0ba4b86..e035bb93 100644
--- a/generator/ast/transform/index.go
+++ b/generator/ast/transform/index.go
@@ -27,7 +27,7 @@ func indexes(m dmmf.Model) []Index {
 
 	if len(m.PrimaryKey.Fields) > 0 {
 		idx = append(idx, Index{
-			Name:         convert(m.PrimaryKey.Fields),
+			Name:         getName(concatFieldsToName(m.PrimaryKey.Fields), m.PrimaryKey.Fields),
 			InternalName: concatFieldsToName(m.PrimaryKey.Fields),
 			Fields:       m.PrimaryKey.Fields,
 		})
@@ -51,10 +51,6 @@ func getName(field string, fields []types.String) types.String {
 	if field != "" {
 		return types.String(field)
 	}
-	return convert(fields)
-}
-
-func convert(fields []types.String) types.String {
 	var name string
 	for _, f := range fields {
 		name += f.GoCase()
diff --git a/generator/ast/transform/models.go b/generator/ast/transform/models.go
index 5edefc56..010a4b75 100644
--- a/generator/ast/transform/models.go
+++ b/generator/ast/transform/models.go
@@ -20,7 +20,7 @@ func (m Model) CompoundKeys() []Index {
 
 	if m.OldModel.PrimaryKey.Name != "" {
 		items = append(items, Index{
-			Name:         types.String(m.OldModel.PrimaryKey.Name.GoCase()),
+			Name:         m.OldModel.PrimaryKey.Name,
 			InternalName: m.OldModel.PrimaryKey.Name.String(),
 			Fields:       m.OldModel.PrimaryKey.Fields,
 		})