diff --git a/build-constraints.yaml b/build-constraints.yaml
index a40992b4..f72a2cc1 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2347,6 +2347,7 @@ packages:
         - http-common
         - http-streams
         - locators
+        - unbeliever
 
     "Sean Hunt <scshunt@csclub.uwaterloo.ca @scshunt":
         - cheapskate