diff --git a/xen/arch/x86/mm/p2m-pt.c b/xen/arch/x86/mm/p2m-pt.c
index 5c64008208..cf6d2a4c6a 100644
--- a/xen/arch/x86/mm/p2m-pt.c
+++ b/xen/arch/x86/mm/p2m-pt.c
@@ -483,7 +483,7 @@ int p2m_pt_handle_deferred_changes(uint64_t gpa)
 /* Reconstruct a fake p2m_access_t from stored PTE flags. */
 static p2m_access_t p2m_flags_to_access(unsigned int flags)
 {
-    if ( flags & _PAGE_PRESENT )
+    if ( !(flags & _PAGE_PRESENT) )
         return p2m_access_n;
 
     /* No need to look at _PAGE_NX for now. */