diff --git a/build-constraints.yaml b/build-constraints.yaml
index da65f331..c0fcec08 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1934,6 +1934,7 @@ packages:
         - hapistrano
         - inflections
         - stache
+        - scalendar
         # - twitter-feed # GHC 8.2.1
 
     "Sergey Alirzaev <zl29ah@gmail.com> @l29ah":