diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9cbfa303..708e7d56 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -182,6 +182,7 @@ packages:
         - blaze-markup
         - hakyll
         - stylish-haskell
+        - websockets
 
     "Antoine Latter":
         - byteorder