diff --git a/build-constraints.yaml b/build-constraints.yaml
index 54d73e67..8ff7defe 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1335,6 +1335,9 @@ packages:
         - dependent-map == 0.1.*
         - dependent-sum == 0.2.*
 
+        # https://github.com/fpco/stackage/issues/768
+        - HUnit < 1.3
+
 # Package flags are applied to individual packages, and override the values of
 # global-flags
 package-flags: