diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index bb95a05259b8..41251d4cf953 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -655,7 +655,7 @@ static void __init xen_e820_swap_entry_with_ram(struct e820_entry *swap_entry)
 			/* Fill new entry (keep size and page offset). */
 			entry->type = swap_entry->type;
 			entry->addr = entry_end - swap_size +
-				      swap_addr - swap_entry->addr;
+				      swap_entry->addr - swap_addr;
 			entry->size = swap_entry->size;
 
 			/* Convert old entry to RAM, align to pages. */