diff --git a/serverup.py b/serverup.py
index 98345d9..9c885b5 100755
--- a/serverup.py
+++ b/serverup.py
@@ -33,7 +33,7 @@ def check(host, port):
         sock.send(b"\x4f\x45\x74\x03" + peer_id + b"\x00\x00\x03")
         return end - start, ipproto
     except socket.error:
-        return None, ""
+        return None, ipproto
     finally:
         sock.close()