diff --git a/build-constraints.yaml b/build-constraints.yaml
index 975af330..4a7b9a50 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2704,7 +2704,7 @@ packages:
         - flexible-defaults
         - funcmp
         - hackage-db
-        - hledger-interest
+        - hledger-interest < 0      # https://github.com/commercialhaskell/stackage/issues/6473
         - hopenssl
         - hsdns
         - hsemail
@@ -3592,7 +3592,7 @@ packages:
         - conduit-aeson
 
     "Hans-Peter Deifel <hpd@hpdeifel.de> @hpdeifel":
-        - hledger-iadd
+        - hledger-iadd < 0          # https://github.com/commercialhaskell/stackage/issues/6473
 
     "Roy Levien <royl@aldaron.com> @orome":
         - crypto-enigma