diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4b5d5a31..9d2c66c1 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2586,6 +2586,8 @@ packages:
         - hw-prim ==0.1.0.3
         - hw-bits ==0.1.0.1
 
+        # https://github.com/fpco/stackage/issues/1965
+        - HUnit < 1.4.0.0
 # end of packages