diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4464feea..7e1217bb 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7,6 +7,8 @@ cabal-format-version: "2.0"
 
 # Constraints for brand new builds
 packages:
+    "Matthew Ahrens <matt.p.ahrens@gmail.com> @mpahrens":
+        - forkable-monad
     "Iris Ward <aditu.venyhandottir@gmail.com> @AdituV":
         - typenums