diff --git a/core/src/main/java/hudson/Util.java b/core/src/main/java/hudson/Util.java
index 66d2d262b4..a43295601c 100644
--- a/core/src/main/java/hudson/Util.java
+++ b/core/src/main/java/hudson/Util.java
@@ -57,6 +57,7 @@ import java.nio.charset.CharacterCodingException;
 import java.nio.charset.Charset;
 import java.nio.charset.CharsetEncoder;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.CopyOption;
 import java.nio.file.FileAlreadyExistsException;
 import java.nio.file.FileSystemException;
 import java.nio.file.FileSystems;
@@ -1071,7 +1072,12 @@ public class Util {
 
     /**
      * Copies a single file by using Ant.
+     *
+     * @deprecated since TODO; use {@link Files#copy(Path, Path, CopyOption...)} directly
      */
+    @Deprecated
+    @Restricted(NoExternalUse.class)
+    @RestrictedSince("TODO")
     public static void copyFile(@NonNull File src, @NonNull File dst) throws BuildException {
         Copy cp = new Copy();
         cp.setProject(new Project());