diff --git a/src/hulk/hurl/hurl.d b/src/hulk/hurl/hurl.d
index 36dc448..8563802 100644
--- a/src/hulk/hurl/hurl.d
+++ b/src/hulk/hurl/hurl.d
@@ -267,7 +267,7 @@ struct Hurl
     public static void identity_map_range(size_t address, size_t length, ulong flags)
     {
         size_t end = address + length;
-        for (size_t page = address & ~0xFFFu; page < end; page += PAGE_SIZE)
+        for (size_t page = address & 0xFFFF_FFFF_FFFF_F000u; page < end; page += PAGE_SIZE)
         {
             map(page, page, flags);
         }