diff --git a/build-constraints.yaml b/build-constraints.yaml
index a231ceac..c9e98326 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2773,7 +2773,7 @@ packages:
         - megaparsec
         - megaparsec-tests
         - mmark
-        - mmark-cli
+        - mmark-cli < 0.0.5.1 # https://github.com/commercialhaskell/stackage/issues/6217
         - mmark-ext
         - modern-uri
         - ormolu