diff --git a/decor/decorator.go b/decor/decorator.go
index d07f23b..53f0964 100644
--- a/decor/decorator.go
+++ b/decor/decorator.go
@@ -167,7 +167,7 @@
 }
 
 // Sync is implementation of Synchronizer interface.
-func (wc *WC) Sync() (chan int, bool) {
+func (wc WC) Sync() (chan int, bool) {
 	if (wc.C&DSyncWidth) != 0 && wc.wsync == nil {
 		panic(fmt.Sprintf("%T is not initialized", wc))
 	}