diff --git a/rule/utils.go b/rule/utils.go
index 38677c8..d2b764f 100644
--- a/rule/utils.go
+++ b/rule/utils.go
@@ -29,6 +29,7 @@ var commonMethods = map[string]bool{
 	"ServeHTTP": true,
 	"String":    true,
 	"Write":     true,
+	"Unwrap":    true,
 }
 
 func receiverType(fn *ast.FuncDecl) string {