diff --git a/build-constraints.yaml b/build-constraints.yaml
index dcf77641..5161e5c7 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4570,6 +4570,9 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/4505
         - th-lift < 0.8
 
+        # https://github.com/commercialhaskell/stackage/issues/4506
+        - port-utils < 0.2.1.0
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of