diff --git a/build-constraints.yaml b/build-constraints.yaml
index e8802850..1c4e6cc9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3467,6 +3467,9 @@ packages:
     "Baojun Wang <wangbj@gmail.com> @wangbj":
         - elf
 
+    "Tom Oram <tom@x2k.co.uk> @tomphp":
+        - cfenv
+
     # If you stop maintaining a package you can move it here.
     # It will then be disabled if it starts causing problems.
     # See https://github.com/fpco/stackage/issues/1056