diff --git a/xen/arch/x86/mm/paging.c b/xen/arch/x86/mm/paging.c
index 8d7f5cbc31..149a59aa8d 100644
--- a/xen/arch/x86/mm/paging.c
+++ b/xen/arch/x86/mm/paging.c
@@ -285,7 +285,7 @@ void paging_mark_dirty(struct domain *d, unsigned long guest_mfn)
     /* We /really/ mean PFN here, even for non-translated guests. */
     pfn = get_gpfn_from_mfn(mfn_x(gmfn));
     /* Shared MFNs should NEVER be marked dirty */
-    BUG_ON(SHARED_M2P(pfn));
+    BUG_ON(paging_mode_translate(d) && SHARED_M2P(pfn));
 
     /*
      * Values with the MSB set denote MFNs that aren't really part of the