diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7d1b14c8..c97aee88 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -88,6 +88,7 @@ packages:
     "Patrick Bahr <paba@itu.dk>":
         - equivalence
         - compdata
+        - Rattus
 
     "Rob Stewart <robstewart57@gmail.com> @robstewart57":
         - gitlab-haskell