diff --git a/server/main.go b/server/main.go
index 7ea1c39..a07b7bc 100644
--- a/server/main.go
+++ b/server/main.go
@@ -74,7 +74,7 @@ func main() {
 		hostname = "localhost:8080"
 	}
 	if s3Prefix == "" {
-		s3Prefix = hostname
+		s3Prefix = "registry.kube5s.ru" // default S3 prefix (old Go hostname)
 	}
 
 	endpoint := os.Getenv("S3_ENDPOINT")