diff --git a/build-constraints.yaml b/build-constraints.yaml
index cfdffbef..f2c476d9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -24,6 +24,7 @@ packages:
         - interpolatedstring-qq2
         - prospect
         - do-notation
+        - unagi-chan
 
     "William Yao <williamyaoh@gmail.com> @williamyaoh":
         - string-interpolate