diff --git a/src/lib_rpc/RPC_context.ml b/src/lib_rpc/RPC_context.ml
index 1b469fa98..71ad995df 100644
--- a/src/lib_rpc/RPC_context.ml
+++ b/src/lib_rpc/RPC_context.ml
@@ -148,3 +148,24 @@ let make_streamed_call s (ctxt : #streamed) p q i =
   and on_close () = push None in
   ctxt#call_streamed_service s ~on_chunk ~on_close p q i >>=? fun close ->
   return (stream, close)
+
+let () =
+  let open Data_encoding in
+  let uri_encoding =
+    conv
+      Uri.to_string
+      Uri.of_string
+      string in
+  register_error_kind
+    `Branch
+    ~id:"RPC_context.Not_found"
+    ~title:"RPC lookup failed"
+    ~description:"RPC lookup failed. No RPC exists at the URL or the RPC tried to access non-existant data."
+    (obj2
+       (req "method" RPC_service.meth_encoding)
+       (req "uri" uri_encoding))
+    ~pp:(fun ppf (_meth, _uri) ->
+        Format.fprintf ppf "Did not find service")
+    (function Not_found { meth ; uri } -> Some (meth, uri)
+            | _ -> None)
+    (fun (meth, uri) -> Not_found { meth ; uri })