diff --git a/build-constraints.yaml b/build-constraints.yaml
index d442f434..d1d91863 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2931,7 +2931,6 @@ packages:
         - fast-digits
         - chimera
         - quadratic-irrational
-        - chimera
 
     "Ashley Yakeley <ashley@semantic.org> @AshleyYakeley":
         - countable