diff --git a/lib/network.py b/lib/network.py
index d40951fde..b9f3c6894 100644
--- a/lib/network.py
+++ b/lib/network.py
@@ -319,7 +319,7 @@ class Network(util.DaemonThread):
         self.queue_request('server.peers.subscribe', [])
         self.request_fee_estimates()
         self.queue_request('blockchain.relayfee', [])
-        for h in self.subscribed_addresses:
+        for h in list(self.subscribed_addresses):
             self.queue_request('blockchain.scripthash.subscribe', [h])
 
     def request_fee_estimates(self):