diff --git a/codex/blockexchange/network/networkpeer.nim b/codex/blockexchange/network/networkpeer.nim
index e2aadb8e..e1f7da8e 100644
--- a/codex/blockexchange/network/networkpeer.nim
+++ b/codex/blockexchange/network/networkpeer.nim
@@ -24,7 +24,7 @@ const
   MaxMessageSize = 100 * 1 shl 20 # manifest files can be big
 
 type
-  ConnProvider* = proc(): Future[Connection] {.gcsafe, closure.}
+  ConnProvider* = proc(): Future[Connection] {.gcsafe, closure, raises: [].}
 
   RPCHandler* = proc(peer: NetworkPeer, msg: Message): Future[void] {.gcsafe.}