diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4013d041..1cd70991 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1560,6 +1560,7 @@ packages:
 
     "Index Int <vlad.z.4096@gmail.com>":
         - transformers-lift
+        - mtl-extras
         - ether
         - union