diff --git a/include/core/utils/converter.h b/include/core/utils/converter.h
index 85b47613e435facc904fa086550512297e40d79b..dceaf3e01bce136b7841c5b9bd015203de200386 100644
--- a/include/core/utils/converter.h
+++ b/include/core/utils/converter.h
@@ -1,14 +1,19 @@
 #ifndef CONVERTER_H
 #define CONVERTER_H
-#include <vector>
+
+// wolf
+#include "core/common/wolf.h"
+
 // Eigen
 #include <eigen3/Eigen/Dense>
 #include <eigen3/Eigen/Geometry>
+
+// std
 #include <regex>
 #include <iostream>
 #include <array>
-
-#include "core/common/wolf.h"
+#include <vector>
+#include <stack>
 
 /**
    @file