diff --git a/tools/atree/files.cpp b/tools/atree/files.cpp
index 5842378..b363214 100644
--- a/tools/atree/files.cpp
+++ b/tools/atree/files.cpp
@@ -5,6 +5,8 @@
 #include <unistd.h>
 #include <dirent.h>
 #include <fnmatch.h>
+#include <string.h>
+#include <stdlib.h>
 
 static bool
 is_comment_line(const char* p)