diff --git a/build-constraints.yaml b/build-constraints.yaml
index 17544ce6..410eb7dc 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2110,7 +2110,6 @@ packages:
         - slug
         - path-io
         - hspec-megaparsec
-        - plan-b
         - zip
         - JuicyPixels-extra
         - identicon