diff --git a/build-constraints.yaml b/build-constraints.yaml
index f6d1aece..bbb10962 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4043,6 +4043,9 @@ packages:
         - egison
         - mini-egison
 
+    "Travis Cardwell <travis.cardwell@extrema.is> @TravisCardwell":
+        - ttc
+
     "Grandfathered dependencies":
         - network
         - Boolean