diff --git a/build-constraints.yaml b/build-constraints.yaml
index a13b3be9..1a3e020c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3449,6 +3449,10 @@ packages:
         # (downstream build failure)
         - quickcheck-instances < 0.3.17
 
+        # https://github.com/athanclark/websockets-rpc/issues/2
+        # (downstream build failure)
+        - websockets-simple < 0.1
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of