diff --git a/build-constraints.yaml b/build-constraints.yaml
index 194bec2d..a404e28c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1713,6 +1713,7 @@ packages:
     "Dennis Gosnell <cdep.illabout@gmail.com> @cdepillabout":
         - envelope
         # GHC 8 - ig
+        - hailgun
         - natural-transformation
         - opaleye-trans
         - read-env-var