diff --git a/nemu/src/monitor/elf.c b/nemu/src/monitor/elf.c
index 4a5067a..47991b1 100644
--- a/nemu/src/monitor/elf.c
+++ b/nemu/src/monitor/elf.c
@@ -100,7 +100,7 @@ void init_elf(const char* elf_file) {
   // filling ftrace
   assert(pstrt != NULL && pstrt != NULL);
   for (int i = 0; i < symt_len; i ++) {
-    Log("---LOG: %3d: %08x %5d %x", i, psymt[i].st_value, psymt[i].st_size, psymt[i].st_name);
+    Log("---LOG: %3d: %08x %5u %x", i, psymt[i].st_value, psymt[i].st_size, psymt[i].st_name);
     if (ELF_ST_TYPE(psymt[i].st_info) == STT_FUNC) {
       // Warning due to elf_ftrace is global variable so you don't need to set '\0' in the end
       // strncpy(elf_ftrace[elf_ftrace_size].fname, pstrt + psymt[i].st_name,