diff --git a/sample_muxer.cpp b/sample_muxer.cpp
index 28c7d0c..f082769 100644
--- a/sample_muxer.cpp
+++ b/sample_muxer.cpp
@@ -9,18 +9,18 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
-#include <memory>
 #include <list>
+#include <memory>
 #include <string>
 
 // libwebm parser includes
-#include "mkvreader.hpp"
 #include "mkvparser.hpp"
+#include "mkvreader.hpp"
 
 // libwebm muxer includes
 #include "mkvmuxer.hpp"
-#include "mkvwriter.hpp"
 #include "mkvmuxerutil.hpp"
+#include "mkvwriter.hpp"
 
 #include "sample_muxer_metadata.h"