diff --git a/go/packages/packagestest/export.go b/go/packages/packagestest/export.go
index cb290fdd5d..4f2b3272d3 100644
--- a/go/packages/packagestest/export.go
+++ b/go/packages/packagestest/export.go
@@ -103,7 +103,7 @@ func TestAll(t *testing.T, f func(*testing.T, Exporter)) {
 // The file deletion in the cleanup can be skipped by setting the skip-cleanup
 // flag when invoking the test, allowing the temporary directory to be left for
 // debugging tests.
-func Export(t *testing.T, exporter Exporter, modules []Module) *Exported {
+func Export(t testing.TB, exporter Exporter, modules []Module) *Exported {
 	t.Helper()
 	dirname := strings.Replace(t.Name(), "/", "_", -1)
 	dirname = strings.Replace(dirname, "#", "_", -1) // duplicate subtests get a #NNN suffix.