--- a/prov/util/src/util_mem_monitor.c
+++ b/prov/util/src/util_mem_monitor.c
@@ -688,7 +688,7 @@
 
 static void ofi_uffd_stop(struct ofi_mem_monitor *monitor)
 {
-	pthread_cancel(uffd.thread);
+	pthread_kill(uffd.thread, 0);
 	pthread_join(uffd.thread, NULL);
 	close(uffd.fd);
 }