diff --git a/build-constraints.yaml b/build-constraints.yaml
index 83f0714c..03d5a10f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3359,6 +3359,7 @@ packages:
 
         # https://github.com/fpco/stackage/issues/3268
         - async < 2.2
+        - async-timer < 0.2
 
         # https://github.com/fpco/stackage/issues/3278
         - lifted-async < 0.10