Index: /trunk/src/VBox/HostDrivers/Support/darwin/SUPDrv-darwin.cpp
===================================================================
--- /trunk/src/VBox/HostDrivers/Support/darwin/SUPDrv-darwin.cpp	(revision 58276)
+++ /trunk/src/VBox/HostDrivers/Support/darwin/SUPDrv-darwin.cpp	(revision 58277)
@@ -130,4 +130,8 @@
 
     RTR0MEMEF_NEW_AND_DELETE_OPERATORS_IOKIT();
+
+private:
+    /** Guard against the parent class growing and us using outdated headers. */
+    uint8_t m_abSafetyPadding[256];
 };
 
@@ -145,4 +149,7 @@
 
 private:
+    /** Guard against the parent class growing and us using outdated headers. */
+    uint8_t m_abSafetyPadding[256];
+
     PSUPDRVSESSION          m_pSession;     /**< The session. */
     task_t                  m_Task;         /**< The client task. */
Index: /trunk/src/VBox/HostDrivers/VBoxUSB/darwin/VBoxUSB.cpp
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxUSB/darwin/VBoxUSB.cpp	(revision 58276)
+++ /trunk/src/VBox/HostDrivers/VBoxUSB/darwin/VBoxUSB.cpp	(revision 58277)
@@ -113,4 +113,8 @@
     virtual void free();
     /** @} */
+
+private:
+    /** Guard against the parent class growing and us using outdated headers. */
+    uint8_t m_abSafetyPadding[256];
 };
 OSDefineMetaClassAndStructors(org_virtualbox_VBoxUSB, IOService);
@@ -149,4 +153,6 @@
 
 private:
+    /** Guard against the parent class growing and us using outdated headers. */
+    uint8_t m_abSafetyPadding[256];
     /** The service provider. */
     org_virtualbox_VBoxUSB *m_pProvider;
@@ -201,5 +207,5 @@
 private:
     /** Padding to guard against parent class expanding (see class remarks). */
-    uint8_t m_abPadding[256];
+    uint8_t m_abSafetyPadding[256];
     /** The interface we're driving (aka. the provider). */
     IOUSBDevice *m_pDevice;
@@ -263,4 +269,6 @@
 
 private:
+    /** Padding to guard against parent class expanding (see class remarks). */
+    uint8_t m_abSafetyPadding[256];
     /** The interface we're driving (aka. the provider). */
     IOUSBInterface *m_pInterface;