diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5a37ca53..acd0c2a5 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2185,6 +2185,9 @@ packages:
         # https://github.com/fpco/stackage/issues/1351
         - webkitgtk3-javascriptcore < 0.14.0.0
 
+        # https://github.com/snoyberg/classy-prelude/issues/124
+        - mono-traversable < 0.10.2
+
 # end of packages