diff --git a/nemu/src/monitor/elf.c b/nemu/src/monitor/elf.c
index 3497cf5..17d5f33 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_sz; i ++) {
-    if (ELF_ST_TYPE(psymt[i].st_info) & STT_FUNC) {
+    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,
       //   sizeof(elf_ftrace[0].fname) - 1);