diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 6a25acb..a28b291 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -784,11 +784,10 @@
 efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
 {
 	struct efi_runtime_mmio_list *newmmio;
-	u64 pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
 	uint64_t addr = *(uintptr_t *)mmio_ptr;
 	efi_status_t ret;
 
-	ret = efi_add_memory_map(addr, pages, EFI_MMAP_IO, false);
+	ret = efi_add_memory_map(addr, len, EFI_MMAP_IO);
 	if (ret != EFI_SUCCESS)
 		return EFI_OUT_OF_RESOURCES;