diff --git a/build-constraints.yaml b/build-constraints.yaml
index 535d4c5a..d25010d4 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -547,7 +547,7 @@ packages:
 
     "Joachim Breitner <mail@joachim-breitner.de>":
         - circle-packing
-        # GHC 8 - arbtt
+        - arbtt
         # GHC 8 - ghc-heap-view
         # GHC 8 - tttool
         # GHC 8 - gipeda