diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9e2bac07..68fd07d5 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -440,7 +440,7 @@ packages:
         - Strafunski-StrategyLib
 
     "Alfredo Di Napoli <alfredo.dinapoli@gmail.com> @adinapoli":
-        - mandrill
+        - mandrill < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
 
     "Jon Schoning <jonschoning@gmail.com> @jonschoning":
         - pinboard