diff --git a/tests/functional/agent/handler.go b/tests/functional/agent/handler.go
index e59c9038b..9a2962604 100644
--- a/tests/functional/agent/handler.go
+++ b/tests/functional/agent/handler.go
@@ -665,6 +665,7 @@ func (srv *Server) handle_SIGQUIT_ETCD_AND_ARCHIVE_DATA() (*rpcpb.Response, erro
 		}
 	}
 
+	// TODO: Verify whether this cleaning of 'cache pages' is needed.
 	srv.lg.Info("cleaning up page cache")
 	if err := cleanPageCache(); err != nil {
 		srv.lg.Warn("failed to clean up page cache", zap.String("error", err.Error()))
diff --git a/tests/functional/agent/utils.go b/tests/functional/agent/utils.go
index 45ea66333..d77fce60b 100644
--- a/tests/functional/agent/utils.go
+++ b/tests/functional/agent/utils.go
@@ -103,6 +103,6 @@ func copyFile(src, dst string) error {
 func cleanPageCache() error {
 	// https://www.kernel.org/doc/Documentation/sysctl/vm.txt
 	// https://github.com/torvalds/linux/blob/master/fs/drop_caches.c
-	cmd := exec.Command("/bin/sh", "-c", `echo "echo 1 > /proc/sys/vm/drop_caches" | sudo sh`)
+	cmd := exec.Command("/bin/sh", "-c", `echo "echo 1 > /proc/sys/vm/drop_caches" | sudo -s -n`)
 	return cmd.Run()
 }