diff --git a/build-constraints.yaml b/build-constraints.yaml
index d45c5612..21764d64 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3080,6 +3080,9 @@ packages:
         # https://github.com/fpco/stackage/issues/2449
         - aeson < 1.2.0.0
 
+        # https://github.com/fpco/stackage/issues/2451
+        - websockets < 0.11.0.0
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of