diff --git a/source/mijin/io/stream.cpp b/source/mijin/io/stream.cpp
index 2bb7ea1..cb74884 100644
--- a/source/mijin/io/stream.cpp
+++ b/source/mijin/io/stream.cpp
@@ -371,6 +371,7 @@ void FileStream::close()
     MIJIN_ASSERT(handle != nullptr, "FileStream is not open.");
     const int result = std::fclose(handle); // NOLINT(cppcoreguidelines-owning-memory)
     MIJIN_ASSERT(result == 0, "fclose failed.");
+    handle = nullptr;
 }
 
 StreamError FileStream::readRaw(std::span<std::uint8_t> buffer, const ReadOptions& options, std::size_t* outBytesRead)