diff --git a/build-constraints.yaml b/build-constraints.yaml
index ec75a7e9..41bed4ee 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5166,9 +5166,6 @@ expected-test-failures:
     # https://github.com/commercialhaskell/stackage/issues/4294
     - asif
 
-    #
-    - mmark-ext
-
 # end of expected-test-failures
 
 # Benchmarks which are known not to build. Note that, currently we do not run