diff --git a/Sources/Eigen/Eigen.cpp b/Sources/Eigen/Eigen.cpp
index 029437b9..87601d92 100644
--- a/Sources/Eigen/Eigen.cpp
+++ b/Sources/Eigen/Eigen.cpp
@@ -1 +1 @@
-#include <Eigen/Eigen>
+#include <Eigen/Eigen.h>
diff --git a/Sources/Eigen/include/Eigen/Eigen b/Sources/Eigen/include/Eigen/Eigen.h
similarity index 71%
rename from Sources/Eigen/include/Eigen/Eigen
rename to Sources/Eigen/include/Eigen/Eigen.h
index 654c8dc6..e1302bf9 100644
--- a/Sources/Eigen/include/Eigen/Eigen
+++ b/Sources/Eigen/include/Eigen/Eigen.h
@@ -1,2 +1,4 @@
+#pragma once
+
 #include "Dense"
 #include "Sparse"
diff --git a/Sources/Eigen/include/Eigen/src/Core/Assign_MKL.h b/Sources/Eigen/include/Eigen/src/Core/Assign_MKL.h
index 0fda71cd..2bc03dab 100644
--- a/Sources/Eigen/include/Eigen/src/Core/Assign_MKL.h
+++ b/Sources/Eigen/include/Eigen/src/Core/Assign_MKL.h
@@ -34,9 +34,13 @@
 #ifndef EIGEN_ASSIGN_VML_H
 #define EIGEN_ASSIGN_VML_H
 
+#include "./util/MKL_support.h"
+
 // IWYU pragma: private
 #include "./InternalHeaderCheck.h"
 
+#if defined(EIGEN_USE_MKL)
+
 namespace Eigen { 
 
 namespace internal {
@@ -178,4 +182,6 @@ EIGEN_MKL_VML_DECLARE_POW_CALL(pow, vmzPowx, dcomplex, MKL_Complex16, LA)
 
 } // end namespace Eigen
 
+#endif // defined(EIGEN_USE_MKL)
+
 #endif // EIGEN_ASSIGN_VML_H