diff --git a/src/syndicate/relays.nim b/src/syndicate/relays.nim
index e3387c1..1cd124b 100644
--- a/src/syndicate/relays.nim
+++ b/src/syndicate/relays.nim
@@ -510,7 +510,7 @@ proc spawnRelays*(turn: var Turn; ds: Cap) =
   # TODO: tcp pattern
   during(turn, ds, transPat) do (ta: Literal[transportAddress.Tcp]):
     try: connectTransport(turn, ds, ta.value)
-    except CatchableError as e:
+    except exceptions.IOError as e:
       publish(turn, ds, TransportConnection(
           `addr`: ta.toPreserve,
           resolved: rejected(embed e),
@@ -519,7 +519,7 @@ proc spawnRelays*(turn: var Turn; ds: Cap) =
   # TODO: unix pattern
   during(turn, ds, transPat) do (ta: Literal[transportAddress.Unix]):
     try: connectTransport(turn, ds, ta.value)
-    except CatchableError as e:
+    except exceptions.IOError as e:
       publish(turn, ds, TransportConnection(
           `addr`: ta.toPreserve,
           resolved: rejected(embed e),