diff --git a/build-constraints.yaml b/build-constraints.yaml
index 28624186..d4dbb397 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4903,7 +4903,7 @@ packages:
     "Benjamin Orchard <thefirstmuffinman@gmail.com> @raehik":
         - flatparse < 0 # https://github.com/commercialhaskell/stackage/issues/6767
         - strongweak
-        - mason
+        - mason < 0 # https://github.com/fumieval/mason/issues/10
 
     "David Terei <code@davidterei.com> @dterei":
         - memcache