diff --git a/aio_pika/robust_connection.py b/aio_pika/robust_connection.py
index 254e089e..59f7a22b 100644
--- a/aio_pika/robust_connection.py
+++ b/aio_pika/robust_connection.py
@@ -95,7 +95,9 @@ async def _on_connected(self) -> None:
             raise RuntimeError("No active transport for connection %r", self)
 
         try:
-            for channel in self.__channels:
+            # Make a copy of the channels to iterate on to guard from
+            # concurrent updates to the set.
+            for channel in list(self.__channels):
                 try:
                     await channel.restore()
                 except Exception: