Index: /trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c
===================================================================
--- /trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c	(revision 39807)
+++ /trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c	(revision 39808)
@@ -836,5 +836,7 @@
         return NULL;
     u.Entry = *pEntry;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 5) || defined(pte_offset_map)
     pte_unmap(pEntry);
+#endif
 
     if (RT_UNLIKELY(!pte_present(u.Entry)))