Index: /trunk/src/org/openstreetmap/josm/tools/PlatformHookOsx.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/tools/PlatformHookOsx.java	(revision 1642)
+++ /trunk/src/org/openstreetmap/josm/tools/PlatformHookOsx.java	(revision 1643)
@@ -230,4 +230,8 @@
 
         Shortcut.registerSystemShortcut("system:about", "reserved", 0, -1).setAutomatic(); // About
+
+        Shortcut.registerSystemShortcut("view:zoomin", "reserved", KeyEvent.VK_ADD, KeyEvent.META_DOWN_MASK); // Zoom in
+        Shortcut.registerSystemShortcut("view:zoomout", "reserved", KeyEvent.VK_SUBTRACT, KeyEvent.META_DOWN_MASK); // Zoom out
+
     }
     public String makeTooltip(String name, Shortcut sc) {