diff --git a/build-constraints.yaml b/build-constraints.yaml
index 8d2386a5..a461f6a2 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3277,6 +3277,9 @@ packages:
         - req < 0.3.0
         - req-conduit < 0.2.0 # because of above
 
+        # https://github.com/fpco/stackage/issues/2595
+        - cassava < 0.5.0.0
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of