Index: /trunk/src/VBox/Main/xml/Settings.cpp
===================================================================
--- /trunk/src/VBox/Main/xml/Settings.cpp	(revision 55118)
+++ /trunk/src/VBox/Main/xml/Settings.cpp	(revision 55119)
@@ -5531,5 +5531,17 @@
                 /* Abort early if possible. */
                 if (fSettingsBumped)
+                    return;
+            }
+
+            for (USBControllerList::const_iterator it = hardwareMachine.usbSettings.llUSBControllers.begin();
+                 it != hardwareMachine.usbSettings.llUSBControllers.end();
+                 ++it)
+            {
+                const USBController &ctrl = *it;
+                if (ctrl.enmType == USBControllerType_XHCI)
+                {
+                    m->sv = SettingsVersion_v1_15;
                     break;
+                }
             }
         }