diff --git a/include/c11log/details/file_helper.h b/include/c11log/details/file_helper.h
index 692fc91a..0d5617f5 100644
--- a/include/c11log/details/file_helper.h
+++ b/include/c11log/details/file_helper.h
@@ -62,6 +62,7 @@ public:
     void close()
     {
         std::fclose(_fd);
+        _fd = nullptr;
     }
 
     void write(const log_msg& msg)