diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5742b200..2ed2f1d0 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1544,6 +1544,7 @@ packages:
 
     "Sven Heyll <svh@posteo.de> @sheyll":
         - b9
+        - type-spec
 
     "Will Thompson <will@willthompson.co.uk> @wjt":
         - bustle