diff --git a/include/encode.h b/include/encode.h
index f28892b..711fae9 100644
--- a/include/encode.h
+++ b/include/encode.h
@@ -24,10 +24,10 @@
  *  for ETC1/ETC1A4 which do not involve swizzling.
  */
 #pragma once
+#include <cassert>
 #include "magick_compat.h"
 #include "rg_etc1.h"
 #include "subimage.h"
-#include <cassert>
 #include <vector>
 
 /** @namespace encode