diff --git a/nemu/src/monitor/elf.c b/nemu/src/monitor/elf.c
index 84315e3..bf8c8aa 100644
--- a/nemu/src/monitor/elf.c
+++ b/nemu/src/monitor/elf.c
@@ -30,7 +30,7 @@ void ftrace_display() {
 int ftrace_inst(char* log, size_t size, vaddr_t pc) {
   for (int i = 0; i < elf_ftrace_size; i ++) {
     if (pc >= elf_ftrace[i].start && pc < elf_ftrace[i].end) {
-      return snprintf(log, size, "%32s", elf_ftrace[i].fname);
+      return snprintf(log, size, "%-31s ", elf_ftrace[i].fname);
     }
   }
   return 0;