diff --git a/build-constraints.yaml b/build-constraints.yaml
index 97d035d7..7ab05b95 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1546,6 +1546,7 @@ packages:
     "Sven Heyll <svh@posteo.de> @sheyll":
         - b9
         - type-spec
+        - pretty-types
 
     "Will Thompson <will@willthompson.co.uk> @wjt":
         - bustle