diff --git a/gateway/operations/mock_adapter_test.go b/gateway/operations/mock_adapter_test.go
index 70a8c18427c..98e96397ef6 100644
--- a/gateway/operations/mock_adapter_test.go
+++ b/gateway/operations/mock_adapter_test.go
@@ -56,10 +56,10 @@ func (a *mockAdapter) GetProperties(_ block.ObjectPointer) (block.Properties, er
 }
 
 func (a *mockAdapter) Remove(_ block.ObjectPointer) error {
-	return errors.New(" remove method not implemented in mock adapter")
+	return errors.New("remove method not implemented in mock adapter")
 }
 func (a *mockAdapter) Copy(_, _ block.ObjectPointer) error {
-	return errors.New(" copy method not implemented in mock adapter")
+	return errors.New("copy method not implemented in mock adapter")
 }
 func (a *mockAdapter) CreateMultiPartUpload(_ block.ObjectPointer, r *http.Request, _ block.CreateMultiPartUploadOpts) (string, error) {
 	panic("try to create multipart in mock adaptor")