diff --git a/build-constraints.yaml b/build-constraints.yaml
index 675fb054..c054f0fc 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3267,7 +3267,8 @@ packages:
         - time-locale-vietnamese
 
     "Tim McGilchrist <timmcgil@gmail.com>  @tmcgilchrist":
-        - riak < 0 # build failure with GHC 8.4 https://github.com/riak-haskell-client/riak-haskell-client/issues/105
+        - riak
+        - riak-protobuf
         - airship < 0 # GHC 8.4 via http-media
         - hedgehog-corpus