diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0badc6ec..ea5f5058 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1724,7 +1724,7 @@ packages:
     "Fumiaki Kinoshita <fumiexcel@gmail.com> @fumieval":
         - boundingboxes
         - control-bool
-        # - extensible # BLOCKED freer-effects compilation failure
+        - extensible
         - monad-skeleton
         - objective
         - witherable
@@ -3920,6 +3920,9 @@ expected-benchmark-failures:
     # https://github.com/raaz-crypto/raaz/issues/338
     - raaz
 
+    # freer-effects compilation failure
+    - extensible 
+
 # end of expected-benchmark-failures