diff --git a/event.c b/event.c
index d2768793..98b1bc4a 100644
--- a/event.c
+++ b/event.c
@@ -1641,10 +1641,12 @@ event_process_active_single_queue(struct event_base *base,
 			break;
 		case EV_CLOSURE_EVENT: {
 			void (*evcb_callback)(evutil_socket_t, short, void *);
+			short res;
 			EVUTIL_ASSERT(ev != NULL);
 			evcb_callback = *ev->ev_callback;
+			res = ev->ev_res;
 			EVBASE_RELEASE_LOCK(base, th_base_lock);
-			evcb_callback(ev->ev_fd, ev->ev_res, ev->ev_arg);
+			evcb_callback(ev->ev_fd, res, ev->ev_arg);
 		}
 		break;
 		case EV_CLOSURE_CB_SELF: {