diff --git a/async/cohttp_async.ml b/async/cohttp_async.ml
index e3e7dec2c0..3b2beb7b0d 100644
--- a/async/cohttp_async.ml
+++ b/async/cohttp_async.ml
@@ -34,7 +34,7 @@ module Net = struct
       >>| function
       | { Addr_info.ai_addr=ADDR_INET (addr,_) }::_ ->
         Or_error.return (host, Ipaddr_unix.of_inet_addr addr, port)
-      | _ -> Or_error.error_string "resolution failed"
+      | _ -> Or_error.error "Failed to resolve Uri" uri Uri.sexp_of_t
 
   let connect_uri ?interrupt uri =
     lookup uri