diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9108d506..1f08fe22 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2696,7 +2696,7 @@ packages:
         - flexible-defaults
         - funcmp
         - hackage-db
-        - hledger-interest
+        - hledger-interest < 0 # https://github.com/commercialhaskell/stackage/issues/6338
         - hopenssl
         - hsdns
         - hsemail
@@ -3586,7 +3586,7 @@ packages:
         - pvar
 
     "Hans-Peter Deifel <hpd@hpdeifel.de> @hpdeifel":
-        - hledger-iadd
+        - hledger-iadd < 0 # https://github.com/commercialhaskell/stackage/issues/6338
 
     "Roy Levien <royl@aldaron.com> @orome":
         - crypto-enigma