diff --git a/build-constraints.yaml b/build-constraints.yaml
index f6b0ab1b..6c17acc6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -165,7 +165,8 @@ packages:
         - cartel
         - Earley
         - ofx
-        - pinchot
+        # https://github.com/massysett/pinchot/issues/2
+        - pinchot < 0.18.0.0
         - validation
 
     "Neil Mitchell":