diff --git a/gtsam/inference/Ordering.h b/gtsam/inference/Ordering.h
index e2e7fac4c..3e7828944 100644
--- a/gtsam/inference/Ordering.h
+++ b/gtsam/inference/Ordering.h
@@ -18,10 +18,6 @@
 
 #pragma once
 
-#include <algorithm>
-#include <vector>
-#include <boost/assign/list_inserter.hpp>
-
 #include <gtsam/inference/Key.h>
 #include <gtsam/inference/VariableIndex.h>
 #include <gtsam/inference/MetisIndex.h>
@@ -29,6 +25,10 @@
 #include <gtsam/base/FastSet.h>
 #include <gtsam/base/FastVector.h>
 
+#include <boost/assign/list_inserter.hpp>
+#include <algorithm>
+#include <vector>
+
 namespace gtsam {
 
   class Ordering : public FastVector<Key> {