diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0149374a..4cf95d49 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4334,7 +4334,7 @@ packages:
         - sydtest-hedgehog
         - sydtest-hedis
         - sydtest-hspec
-        - sydtest-mongo
+        - sydtest-mongo < 0 # https://github.com/NorfairKing/sydtest/issues/99
         - sydtest-persistent
         - sydtest-persistent-postgresql
         - sydtest-persistent-sqlite