diff --git a/build-constraints.yaml b/build-constraints.yaml
index 18f7e096..435a550a 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -447,7 +447,7 @@ packages:
 
     "Li-yao Xia <lysxia@gmail.com> @Lysxia":
         - boltzmann-samplers
-        - first-class-families
+        - first-class-families < 0.7.0.0 # https://github.com/commercialhaskell/stackage/issues/5117
         - generic-data
         - generic-data-surgery < 0 # via generic-data
         - generic-random