diff --git a/build-constraints.yaml b/build-constraints.yaml
index 578603be..04971712 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1066,6 +1066,9 @@ packages:
         # https://github.com/fpco/stackage/issues/610
         - either < 4.4
 
+        # https://github.com/fpco/stackage/issues/615
+        - syb < 0.5
+
 # Package flags are applied to individual packages, and override the values of
 # global-flags
 package-flags: