diff --git a/build-constraints.yaml b/build-constraints.yaml
index aace02d0..706205d6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4368,6 +4368,11 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/4347
         - snap-server < 1.1.1.0
 
+        # https://github.com/commercialhaskell/stackage/issues/4373
+        - dejafu < 2.0.0.0
+        - hunit-dejafu < 2.0.0.0
+        - tasty-dejafu < 2.0.0.0
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of