diff --git a/kernel/mm/mm.cc b/kernel/mm/mm.cc
index b319d21..2079ae3 100644
--- a/kernel/mm/mm.cc
+++ b/kernel/mm/mm.cc
@@ -56,13 +56,12 @@ void mm_bootstrap()
     for (int mmap_idx = 0; mmap_idx < mm_mmap_num_entries; mmap_idx++)
     {
         u32_t base_address = mm_mmap_entries[mmap_idx].base;
+        u32_t address_limit = base_address + mm_mmap_entries[mmap_idx].length;
         if (base_address & PAGE_LOW_MASK)
         {
             /* start of this mmap range is not page-aligned */
             base_address = (base_address & PAGE_HIGH_MASK) + PAGE_SIZE;
         }
-        u32_t address_limit = mm_mmap_entries[mmap_idx].base +
-                              mm_mmap_entries[mmap_idx].length;
         if (address_limit & PAGE_LOW_MASK)
         {
             /* end of this mmap range is not page-aligned */