diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 7c8bb46e83e48053e3796c02da85d0e3e89361b2..b8e461d4941208fab60f977471dbe088ce48d23e 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -746,7 +746,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 		old_start = mr[i].start;
 		memmove(&mr[i], &mr[i+1],
 			 (nr_range - 1 - i) * sizeof (struct map_range));
-		mr[i].start = old_start;
+		mr[i--].start = old_start;
 		nr_range--;
 	}