diff --git a/MathLib/MathTools.h b/MathLib/MathTools.h
index 1dcd438834cc18ed5659847c4c73fcbe73ced38e..6018091a454ec1fa979adb89e82e32935504f0eb 100644
--- a/MathLib/MathTools.h
+++ b/MathLib/MathTools.h
@@ -9,6 +9,7 @@
 
 #pragma once
 
+#include <Eigen/Eigen>
 #include <cstddef>
 
 #ifdef _OPENMP
diff --git a/MathLib/Vector3.h b/MathLib/Vector3.h
index 9b9985fa50dd5f3b6d9a2d4397c9d8b1bdeb118a..191b4df39443cb2bb37e1741b8a4a3ffa14c6072 100644
--- a/MathLib/Vector3.h
+++ b/MathLib/Vector3.h
@@ -16,7 +16,6 @@
 
 #pragma once
 
-#include <Eigen/Eigen>
 #include <cmath>
 
 #include "MathTools.h"