diff --git a/scapy/volatile.py b/scapy/volatile.py
index 5be8a72c3e8183e41af96edb080d836b8b1a4501..f8f62a37657e996040604c9ab04139327ca9c81c 100644
--- a/scapy/volatile.py
+++ b/scapy/volatile.py
@@ -303,7 +303,7 @@ class RandIP6(RandString):
         if len(ip) == 9:
             ip.remove("")
         if ip[-1] == "":
-          ip[-1] = 0
+          ip[-1] = "0"
         return ":".join(ip)
 
 class RandOID(RandString):