diff --git a/smp/mptables.c b/smp/mptables.c
index b1485d89..f708ef82 100644
--- a/smp/mptables.c
+++ b/smp/mptables.c
@@ -85,8 +85,8 @@ static mpf_t *get_mpf_addr(void) {
     if (ptr)
         return ptr;
 
-    sysm_addr = paddr_to_virt_kern(get_memory_range_end(KB(512)));
-    ptr = find_mpf(sysm_addr - KB(1), sysm_addr);
+    sysm_addr = kmap_4k(paddr_to_mfn(get_memory_range_end(KB(512)) - KB(1)), L1_PROT_RO);
+    ptr = find_mpf(sysm_addr, sysm_addr + KB(1));
     if (ptr)
         return ptr;