diff --git a/build-constraints.yaml b/build-constraints.yaml
index c0e7bf8a..74629a98 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4901,7 +4901,7 @@ packages:
         - currycarbon
 
     "Benjamin Orchard <thefirstmuffinman@gmail.com> @raehik":
-        - flatparse
+        - flatparse < 0 # https://github.com/commercialhaskell/stackage/issues/6767
         - strongweak
         - mason