diff --git a/nemu/src/memory/paddr.c b/nemu/src/memory/paddr.c
index 1434f82..98c5ffd 100644
--- a/nemu/src/memory/paddr.c
+++ b/nemu/src/memory/paddr.c
@@ -53,7 +53,7 @@ void init_mem() {
 word_t paddr_read(paddr_t addr, int len) {
   if (likely(in_pmem(addr))) return pmem_read(addr, len);
   IFDEF(CONFIG_DEVICE, return mmio_read(addr, len));
-  IFDEF(CONFIG_MTRACE, printf("R " FMT_WORD "%d\n", addr, len));
+  IFDEF(CONFIG_MTRACE, Log("R " FMT_WORD "%d\n", addr, len));
   out_of_bound(addr);
   return 0;
 }
@@ -61,6 +61,6 @@ word_t paddr_read(paddr_t addr, int len) {
 void paddr_write(paddr_t addr, int len, word_t data) {
   if (likely(in_pmem(addr))) { pmem_write(addr, len, data); return; }
   IFDEF(CONFIG_DEVICE, mmio_write(addr, len, data); return);
-  IFDEF(CONFIG_MTRACE, printf("W " FMT_WORD "%d D" FMT_WORD "\n", addr, len, data));
+  IFDEF(CONFIG_MTRACE, Log("W " FMT_WORD "%d D" FMT_WORD "\n", addr, len, data));
   out_of_bound(addr);
 }