diff --git a/src/runtime/uv/dns.cpp b/src/runtime/uv/dns.cpp
index 6c228e1056..d49a6a4e90 100644
--- a/src/runtime/uv/dns.cpp
+++ b/src/runtime/uv/dns.cpp
@@ -138,10 +138,6 @@ extern "C" LEAN_EXPORT lean_obj_res lean_uv_dns_get_name(b_obj_arg addr) {
     int result = uv_getnameinfo(global_ev.loop, req, [](uv_getnameinfo_t* req, int status, const char* hostname, const char* service) {
         lean_object* promise = (lean_object*) req->data;
 
-        lean_object * r = lean_alloc_ctor(0, 2, 0);
-        lean_ctor_set(r, 0, lean_mk_string(hostname));
-        lean_ctor_set(r, 1, lean_mk_string(service));
-
         if (status != 0) {
             lean_promise_resolve_with_code(status, promise);
             lean_dec(promise);
@@ -149,6 +145,10 @@ extern "C" LEAN_EXPORT lean_obj_res lean_uv_dns_get_name(b_obj_arg addr) {
             return;
         }
 
+        lean_object * r = lean_alloc_ctor(0, 2, 0);
+        lean_ctor_set(r, 0, lean_mk_string(hostname));
+        lean_ctor_set(r, 1, lean_mk_string(service));
+
         lean_promise_resolve(mk_except_ok(r), promise);
         lean_dec(promise);