diff --git a/src/go/build/deps_test.go b/src/go/build/deps_test.go
index 64f084152a..ab85c99602 100644
--- a/src/go/build/deps_test.go
+++ b/src/go/build/deps_test.go
@@ -621,7 +621,7 @@ func TestDependencies(t *testing.T) {
 	}
 }
 
-var buildIgnore = []byte("\n// +build ignore")
+var buildIgnore = []byte("\n//go:build ignore")
 
 func findImports(pkg string) ([]string, error) {
 	vpkg := pkg