diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9a157d22..c561e2ca 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -921,7 +921,7 @@ packages:
         - incremental-parser
         - monoid-subclasses
         - picoparsec < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
-        - rank2classes < 0 # via template-haskell-2.15.0.0
+        - rank2classes
 
     "Brent Yorgey <byorgey@gmail.com> @byorgey":
         - active