diff --git a/codex/erasure/erasure.nim b/codex/erasure/erasure.nim
index 95516500..85b0138a 100644
--- a/codex/erasure/erasure.nim
+++ b/codex/erasure/erasure.nim
@@ -362,7 +362,7 @@ proc asyncEncode*(
 
 proc encodeData(
     self: Erasure, manifest: Manifest, params: EncodingParams
-): Future[?!Manifest] {.async.} =
+): Future[?!Manifest] {.async: (raises: [CancelledError]).} =
   ## Encode blocks pointed to by the protected manifest
   ##
   ## `manifest` - the manifest to encode
@@ -461,7 +461,7 @@ proc encode*(
     blocks: Natural,
     parity: Natural,
     strategy = SteppedStrategy,
-): Future[?!Manifest] {.async.} =
+): Future[?!Manifest] {.async: (raises: [CancelledError]).} =
   ## Encode a manifest into one that is erasure protected.
   ##
   ## `manifest`   - the original manifest to be encoded
@@ -554,7 +554,7 @@ proc asyncDecode*(
 
 proc decodeInternal(
     self: Erasure, encoded: Manifest
-): Future[?!(ref seq[Cid], seq[Natural])] {.async.} =
+): Future[?!(ref seq[Cid], seq[Natural])] {.async: (raises:[CancelledError]).} =
   logScope:
     steps = encoded.steps
     rounded_blocks = encoded.rounded
@@ -638,7 +638,9 @@ proc decodeInternal(
 
   return (cids, recoveredIndices).success
 
-proc decode*(self: Erasure, encoded: Manifest): Future[?!Manifest] {.async.} =
+proc decode*(
+    self: Erasure, encoded: Manifest
+): Future[?!Manifest] {.async: (raises: [CancelledError]).} =
   ## Decode a protected manifest into it's original
   ## manifest
   ##