diff --git a/openrpc-client.asd b/openrpc-client.asd
index a7438b1..5326ee1 100644
--- a/openrpc-client.asd
+++ b/openrpc-client.asd
@@ -10,6 +10,7 @@
   :description "OpenRPC client implementation for Common Lisp."
   :homepage "https://40ants.com/openrpc/"
   :source-control (:git "https://github.com/40ants/openrpc")
-  :in-order-to ((test-op (test-op openrpc-tests))))
+  :in-order-to ((test-op (test-op openrpc-tests))
+                (load-op (load-op jsonrpc))))
 
 (register-system-packages "log4cl" '(#:log))