diff --git a/include/fmt/os.h b/include/fmt/os.h
index b64f8bbf..960a66eb 100644
--- a/include/fmt/os.h
+++ b/include/fmt/os.h
@@ -247,10 +247,8 @@ class buffered_file {
     other.file_ = nullptr;
   }
 
-  buffered_file& operator=(buffered_file&& other) {
-    close();
-    file_ = other.file_;
-    other.file_ = nullptr;
+  buffered_file& operator=(buffered_file&& other) FMT_NOEXCEPT {
+    std::swap(file_, other.file_);
     return *this;
   }