diff --git a/build-constraints.yaml b/build-constraints.yaml
index d54091cd..ad96999b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7560,6 +7560,7 @@ expected-test-failures:
     - xml-picklers # https://github.com/Philonous/xml-picklers/issues/5
     - xmlbf
     - yesod-gitrev # needs a git repo https://github.com/commercialhaskell/stackage/issues/6132
+    - yesod-markdown # https://github.com/pbrisbin/yesod-markdown/issues/77
 
     # Assertion failures due to module name ambiguity.
     # These _should_ be fixed by using the `hide` section of this file