diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4b691950..5cb92259 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2591,6 +2591,7 @@ packages:
         - network-messagepack-rpc
         - network-messagepack-rpc-websocket < 0
         - unicode-show
+        - deriveJsonNoPrefix
 
     "Hans-Christian Esperer <hc@hcesperer.org> @hce":
         - avwx