diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3840123c..ec17c30b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -34,6 +34,7 @@ packages:
         - do-notation
         - unagi-chan
         - type-errors
+        - loopbreaker
 
     "William Yao <williamyaoh@gmail.com> @williamyaoh":
         - string-interpolate