diff --git a/build-constraints.yaml b/build-constraints.yaml
index b9124818..8af6a7cd 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -907,6 +907,7 @@ packages:
         - ghcjs-dom
         - jsaddle
         - leksah-server
+        - ltk
         - vado
         - vcsgui
         - vcswrapper