diff --git a/build-constraints.yaml b/build-constraints.yaml
index 44cb886a..b3714eaf 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1835,7 +1835,7 @@ packages:
 
     "Peter Simons <simons@cryp.to> @peti":
         - distribution-nixpkgs
-        # - cabal2nix # BLOCKED aeson 1.0
+        - cabal2nix
         - funcmp
         - hackage-db
         - hledger-interest