diff --git a/build-constraints.yaml b/build-constraints.yaml
index 85d207a4..65c78785 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4716,6 +4716,9 @@ packages:
       # https://github.com/commercialhaskell/stackage/issues/5211
       - small-bytearray-builder < 0.3.4
 
+      # https://github.com/commercialhaskell/stackage/issues/5218
+      - unliftio-core < 0.2
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of