diff --git a/nemu/src/monitor/sdb/.gitignore b/nemu/src/monitor/sdb/.gitignore
index 4fccbf4..e69de29 100644
--- a/nemu/src/monitor/sdb/.gitignore
+++ b/nemu/src/monitor/sdb/.gitignore
@@ -1,2 +0,0 @@
-addrexp_lex.h
-addrexp.h
\ No newline at end of file