diff --git a/build-constraints.yaml b/build-constraints.yaml
index ac0f1300..c603277b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1396,7 +1396,7 @@ packages:
         # - language-thrift # megaparsec bounds: https://github.com/fpco/stackage/issues/2666
 
     "Adam C. Foltzer <acfoltzer@galois.com> @acfoltzer":
-        - cryptol
+        - cryptol < 0 # Happy setup-depends https://github.com/fpco/stackage/issues/2927
         - gitrev
         - persistent-refs