Index: trunk/src/org/openstreetmap/josm/actions/RenameLayerAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/RenameLayerAction.java	(revision 9590)
+++ trunk/src/org/openstreetmap/josm/actions/RenameLayerAction.java	(revision 9591)
@@ -84,4 +84,6 @@
                 }
                 File newFile = new File(newname);
+                if (!SaveActionBase.confirmOverwrite(newFile))
+                    return;
                 if (Main.platform.rename(file, newFile)) {
                     layer.setAssociatedFile(newFile);