diff --git a/build-constraints.yaml b/build-constraints.yaml
index ea165d00..a9e3632d 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4161,7 +4161,7 @@ packages:
 
     "Domen Kozar <domen@enlambda.com> @domenkozar":
         - elm2nix
-        - mixpanel-client
+        - mixpanel-client < 0 # aeson 2, https://github.com/commercialhaskell/stackage/issues/6443
         - netrc
         - pretty-sop
         - servant-auth