diff --git a/build-constraints.yaml b/build-constraints.yaml
index 708fb9dd..2831136e 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3458,6 +3458,9 @@ packages:
         # https://github.com/fpco/stackage/issues/3620
         - tasty < 1.1
 
+        # https://github.com/fpco/stackage/issues/3629
+        - extensible < 0.4.9
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of