diff --git a/types.go b/types.go
index 9096720..da5a2f8 100644
--- a/types.go
+++ b/types.go
@@ -25,7 +25,6 @@ type Database interface {
 	// C(name string) Collection
 	Name() string
 	EnsureIndex(m ModelInterface, index ...Index) error
-	ValidateObject(m ModelInterface, changes bson.M) error
 	ReadDocument(m ModelInterface, selector bson.M) error
 	CreateDocument(m ModelInterface) error
 	ReadCollection(results interface{}, filter bson.M, selector bson.M, offset int, limit int, sort []string, pipelineModifier PipelineModifierFunction) error
diff --git a/validator.go b/validator.go
index 5b13502..b2ea77d 100644
--- a/validator.go
+++ b/validator.go
@@ -6,7 +6,7 @@ import (
 )
 
 // ValidateObject validates object via validator tag and custom method
-func (db *MgoDatabase) ValidateObject(m ModelInterface, changes bson.M) error {
+func ValidateObject(db Database, m ModelInterface, changes bson.M) error {
 	// first validate via struct tag
 	validator := validator.New(&validator.Config{
 		TagName: "validator",