Index: /trunk/src/VBox/Main/xml/Settings.cpp
===================================================================
--- /trunk/src/VBox/Main/xml/Settings.cpp	(revision 29592)
+++ /trunk/src/VBox/Main/xml/Settings.cpp	(revision 29593)
@@ -4005,4 +4005,10 @@
         m->sv = SettingsVersion_v1_10;
 
+    // VirtualBox 3.2 adds support for page fusion
+    if (    m->sv < SettingsVersion_v1_10
+        &&  hardwareMachine.fPageFusionEnabled
+       )
+        m->sv = SettingsVersion_v1_10;
+
     // VirtualBox 3.2 adds NAT and boot priority to the NIC config in Main.
     if (m->sv < SettingsVersion_v1_10)