diff --git a/kernel/amd64/mm.c b/kernel/amd64/mm.c
index b2ad093..48b070a 100644
--- a/kernel/amd64/mm.c
+++ b/kernel/amd64/mm.c
@@ -132,7 +132,7 @@ void mm_map_page (struct pd* pd, uintptr_t paddr, uintptr_t vaddr, uint32_t flag
 
   uint64_t* pte = &pml1[pg_index.pml1];
 
-  *pte = ((paddr & ~0xFFFULL) | (flags & 0x7ULL));
+  *pte = ((paddr & ~0xFFFULL) | (flags & 0xFFFULL));
 }
 
 /* Map a page into kernel page directory */