diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3119124c..b46f11c1 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4378,6 +4378,7 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/4343
         - hledger-lib < 1.13
+        - hledger-iadd < 1.3.8
 
         # https://github.com/commercialhaskell/stackage/issues/4344
         - pandoc < 2.6