diff --git a/build-constraints.yaml b/build-constraints.yaml
index b4cef52a..a0783400 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1745,7 +1745,7 @@ packages:
     "Brandon Martin <brandon@codedmart.com> @codedmart":
         []
         # GHC 8 & via engine-io - engine-io-wai
-        # - rethinkdb # BLOCKED aeson 1.0
+        - rethinkdb
 
     "Michael Walker <mike@barrucadu.co.uk> @barrucadu":
         - both