diff --git a/build-constraints.yaml b/build-constraints.yaml
index 97da7df0..1866a701 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -42,7 +42,7 @@ packages:
         - hamtsolo
 
     "Ferdinand van Walree <ferdinandvwalree@gmail.com> @Ferdinand-vW":
-        []
+        - tuple-sop
         # - sessiontypes # lens 4.16 via diagrams
         # - sessiontypes-distributed # lens 4.16 via diagrams