diff --git a/internal/biz/greeter.go b/internal/biz/greeter.go
index 51aeaa68ad3dcc558e7810eabd1a6f7381017e1f..5147ac1fa4f7f154600da9ddda6722b9a7df557e 100644
--- a/internal/biz/greeter.go
+++ b/internal/biz/greeter.go
@@ -30,7 +30,6 @@ type GreeterRepo interface {
 // GreeterUsecase is a Greeter usecase.
 type GreeterUsecase struct {
 	repo GreeterRepo
-	log  *log.Helper
 }
 
 // NewGreeterUsecase new a Greeter usecase.