diff --git a/internal/registry/obj_info_test.go b/internal/registry/obj_info_test.go
index f53f6db..6cd156f 100644
--- a/internal/registry/obj_info_test.go
+++ b/internal/registry/obj_info_test.go
@@ -101,7 +101,7 @@ func randomObjectInfo() ObjectInfo {
 func randString(n int) string {
 	var sb strings.Builder
 	for i := 0; i < n; i++ {
-		sb.WriteRune('a' + rune(rand.Int())%('z'-'a'+1))
+		sb.WriteRune('a' + rune(rand.Int31())%('z'-'a'+1))
 	}
 	return sb.String()
 }