diff --git a/abe/cpabe/tkn20/testdata/serialize.go b/abe/cpabe/tkn20/testdata/serialize.go
index 9ca854a63..dda77eb00 100644
--- a/abe/cpabe/tkn20/testdata/serialize.go
+++ b/abe/cpabe/tkn20/testdata/serialize.go
@@ -1,3 +1,5 @@
+//go:build exclude
+
 package main
 
 import (