diff --git a/effect/default_effector.go b/effect/default_effector.go
index <HASH>..<HASH> 100644
--- a/effect/default_effector.go
+++ b/effect/default_effector.go
@@ -14,7 +14,7 @@
 
 package effect
 
-import "github.com/pkg/errors"
+import "errors"
 
 // DefaultEffector is default effector for Casbin.
 type DefaultEffector struct {
Fix the bug of importing "github.com/pkg/errors".