diff --git a/tools/atree/fs.h b/tools/atree/fs.h
index 4080880..fd4ae3e 100644
--- a/tools/atree/fs.h
+++ b/tools/atree/fs.h
@@ -8,5 +8,6 @@
 int remove_recursively(const string& path);
 int mkdir_recursively(const string& path);
 int copy_file(const string& src, const string& dst);
+int strip_file(const string& path);
 
 #endif // FS_H