diff --git a/cid_fuzz.go b/cid_fuzz.go
index 0bdd7e6..0b0408c 100644
--- a/cid_fuzz.go
+++ b/cid_fuzz.go
@@ -1,3 +1,4 @@
+//go:build gofuzz
 // +build gofuzz
 
 package cid