diff --git a/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php b/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php
index b2b1528..ecd1bb1 100644
--- a/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php
+++ b/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php
@@ -195,7 +195,7 @@ protected function doImport($source_path, $destination_path, $configuration = []
    * @return
    *   File URI.
    */
-  function createUri($filepath = NULL, $contents = NULL, $scheme = NULL) {
+  protected function createUri($filepath = NULL, $contents = NULL, $scheme = NULL) {
     if (!isset($filepath)) {
       // Prefix with non-latin characters to ensure that all file-related
       // tests work with international filenames.