diff --git a/build-constraints.yaml b/build-constraints.yaml
index edeb6535..0d5918a9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3193,7 +3193,7 @@ packages:
         - massiv-io
 
     "Hans-Peter Deifel <hpd@hpdeifel.de> @hpdeifel":
-        - hledger-iadd
+        - hledger-iadd < 0 # hpdeifel/hledger-iadd#40
 
     "Roy Levien <royl@aldaron.com> @orome":
         - crypto-enigma