diff --git a/build-constraints.yaml b/build-constraints.yaml
index f22bd3a4..cdbe96eb 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5233,6 +5233,7 @@ packages:
         - rawfilepath < 0
         - record-wrangler < 0
         - regex-compat-tdfa < 0
+        - req-conduit < 0 # https://github.com/mrkkrp/req-conduit/issues/12
         - rhine < 0
         - rose-trees < 0 # compilation seems to hang?
         - safe-money < 0