diff --git a/vm/page.c b/vm/page.c
index 6384207..3ce268c 100644
--- a/vm/page.c
+++ b/vm/page.c
@@ -38,7 +38,7 @@ static size_t page_order_bytes[] = {
 	[VM_PAGE_64G] = 0x1000000000,
 };
 
-phys_addr_t vm_virt_to_phys(void *p)
+phys_addr_t vm_virt_to_phys(const void *p)
 {
 	uintptr_t pv = (uintptr_t)p;