diff --git a/build-constraints.yaml b/build-constraints.yaml
index 29c3d424..2f9e3960 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8558,6 +8558,9 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/7309
         - zlib < 0.7
+
+        # https://github.com/commercialhaskell/stackage/issues/7312
+        - numhask < 0.12
     # end of Stackage upper bounds
 # end of packages