Index: trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java	(revision 1165)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java	(revision 1166)
@@ -213,5 +213,5 @@
 			value = null; // delete the key
 		String newkey = keys.getEditor().getItem().toString();
-		newkey = java.text.Normalizer.normalize(value, java.text.Normalizer.Form.NFC);
+		newkey = java.text.Normalizer.normalize(newkey, java.text.Normalizer.Form.NFC);
 		if (newkey.equals("")) {
 			newkey = key;