diff --git a/scope.go b/scope.go
index 397ccf0b..3db54fb8 100644
--- a/scope.go
+++ b/scope.go
@@ -24,6 +24,7 @@ type Scope struct {
 	skipLeft        bool
 	fields          *[]*Field
 	selectAttrs     *[]string
+	Trace           interface{}
 }
 
 // IndirectValue return scope's reflect value's indirect value