diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3abea434..f9753e61 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3869,9 +3869,6 @@ expected-test-failures:
     # https://github.com/bos/attoparsec/issues/131
     - attoparsec
 
-    # https://github.com/jdreaver/sum-type-boilerplate/issues/1
-    - sum-type-boilerplate
-
     # https://github.com/osa1/hslua/issues/58
     - hslua