diff --git a/service/ptos/arch/amd64/cpu/mmu.c b/service/ptos/arch/amd64/cpu/mmu.c
index ad6845b..f876052 100644
--- a/service/ptos/arch/amd64/cpu/mmu.c
+++ b/service/ptos/arch/amd64/cpu/mmu.c
@@ -164,6 +164,7 @@ MmuPageMapExtract(MMU_VAS *Vas, UPTR VirtualBase, PAGEMAP_LEVEL Level, BOOLEAN A
         PhysicalBase = PFN_TO_ADDRESS(Pfn);
         PageMap[Index] = PhysicalBase | (PTE_P | PTE_RW | PTE_US);
         PageMap = PMA_TO_VMA(PhysicalBase);
+        RtlMemSet(PageMap, 0, PAGESIZE);
         --CurrentLevel;
     }