diff --git a/OndselSolver/AbsConstraint.h b/OndselSolver/AbsConstraint.h
index 81a6549..e0a9127 100644
--- a/OndselSolver/AbsConstraint.h
+++ b/OndselSolver/AbsConstraint.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "Constraint.h"
 namespace MbD {
 	class AbsConstraint : public Constraint
diff --git a/OndselSolver/AngleZConstraintIqcJc.h b/OndselSolver/AngleZConstraintIqcJc.h
index 7b9cbd3..7399baa 100644
--- a/OndselSolver/AngleZConstraintIqcJc.h
+++ b/OndselSolver/AngleZConstraintIqcJc.h
@@ -8,6 +8,8 @@
 
 #pragma once
 
+#include <cstdint>
+
 #include "AngleZConstraintIJ.h"
 
 namespace MbD {
diff --git a/OndselSolver/AngleZConstraintIqcJqc.h b/OndselSolver/AngleZConstraintIqcJqc.h
index 09ed7ea..7f0c8b9 100644
--- a/OndselSolver/AngleZConstraintIqcJqc.h
+++ b/OndselSolver/AngleZConstraintIqcJqc.h
@@ -8,6 +8,8 @@
 
 #pragma once
 
+#include <cstdint>
+
 #include "AngleZConstraintIqcJc.h"
 
 namespace MbD {
diff --git a/OndselSolver/AnyPosICNewtonRaphson.h b/OndselSolver/AnyPosICNewtonRaphson.h
index bdfcd8f..1bd8b2b 100644
--- a/OndselSolver/AnyPosICNewtonRaphson.h
+++ b/OndselSolver/AnyPosICNewtonRaphson.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "PosNewtonRaphson.h"
 #include "DiagonalMatrix.h"
 
diff --git a/OndselSolver/AtPointConstraintIqcJc.h b/OndselSolver/AtPointConstraintIqcJc.h
index 8b35076..fc02f18 100644
--- a/OndselSolver/AtPointConstraintIqcJc.h
+++ b/OndselSolver/AtPointConstraintIqcJc.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "AtPointConstraintIJ.h"
 
 namespace MbD {
diff --git a/OndselSolver/AtPointConstraintIqcJqc.h b/OndselSolver/AtPointConstraintIqcJqc.h
index af92c92..dd2b42b 100644
--- a/OndselSolver/AtPointConstraintIqcJqc.h
+++ b/OndselSolver/AtPointConstraintIqcJqc.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "AtPointConstraintIqcJc.h"
 
 namespace MbD {
diff --git a/OndselSolver/ConstVelConstraintIqcJc.h b/OndselSolver/ConstVelConstraintIqcJc.h
index 7f953d0..3c6ddc7 100644
--- a/OndselSolver/ConstVelConstraintIqcJc.h
+++ b/OndselSolver/ConstVelConstraintIqcJc.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "ConstVelConstraintIJ.h"
 
 namespace MbD {
diff --git a/OndselSolver/ConstVelConstraintIqcJqc.h b/OndselSolver/ConstVelConstraintIqcJqc.h
index d483400..6ea25cc 100644
--- a/OndselSolver/ConstVelConstraintIqcJqc.h
+++ b/OndselSolver/ConstVelConstraintIqcJqc.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "ConstVelConstraintIqcJc.h"
 
 namespace MbD {
diff --git a/OndselSolver/Constraint.cpp b/OndselSolver/Constraint.cpp
index 3b461be..7f067b2 100644
--- a/OndselSolver/Constraint.cpp
+++ b/OndselSolver/Constraint.cpp
@@ -8,6 +8,7 @@
 
 #include <functional>
 #include <chrono>
+#include <cstdint>
 
 #include "Constraint.h"
 #include "FullColumn.h"
diff --git a/OndselSolver/Constraint.h b/OndselSolver/Constraint.h
index 119b627..a7409a8 100644
--- a/OndselSolver/Constraint.h
+++ b/OndselSolver/Constraint.h
@@ -8,6 +8,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <memory>
 
 #include "enum.h"
diff --git a/OndselSolver/DirectionCosineConstraintIqcJc.h b/OndselSolver/DirectionCosineConstraintIqcJc.h
index f520af6..a8aed53 100644
--- a/OndselSolver/DirectionCosineConstraintIqcJc.h
+++ b/OndselSolver/DirectionCosineConstraintIqcJc.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "DirectionCosineConstraintIJ.h"
 
 namespace MbD {
diff --git a/OndselSolver/DirectionCosineConstraintIqcJqc.h b/OndselSolver/DirectionCosineConstraintIqcJqc.h
index 5d68fcd..d76e34c 100644
--- a/OndselSolver/DirectionCosineConstraintIqcJqc.h
+++ b/OndselSolver/DirectionCosineConstraintIqcJqc.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "DirectionCosineConstraintIqcJc.h"
 
 namespace MbD {
diff --git a/OndselSolver/DispCompIecJecO.h b/OndselSolver/DispCompIecJecO.h
index 74a1ca4..235e61a 100644
--- a/OndselSolver/DispCompIecJecO.h
+++ b/OndselSolver/DispCompIecJecO.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "KinematicIeJe.h"
 
 namespace MbD {
diff --git a/OndselSolver/EulerConstraint.h b/OndselSolver/EulerConstraint.h
index 2e6cdcc..583d068 100644
--- a/OndselSolver/EulerConstraint.h
+++ b/OndselSolver/EulerConstraint.h
@@ -8,6 +8,7 @@
  
 #pragma once
 
+#include <cstdint>
 #include <memory>
 #include <vector>
 
diff --git a/OndselSolver/FullMatrix.h b/OndselSolver/FullMatrix.h
index 1013791..90e54aa 100644
--- a/OndselSolver/FullMatrix.h
+++ b/OndselSolver/FullMatrix.h
@@ -9,6 +9,7 @@
 #pragma once
 
 #include <cmath>
+#include <cstdint>
 #include <memory>
 
 #include "RowTypeMatrix.h"
diff --git a/OndselSolver/GESpMat.h b/OndselSolver/GESpMat.h
index 1508044..70def30 100644
--- a/OndselSolver/GESpMat.h
+++ b/OndselSolver/GESpMat.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "MatrixGaussElimination.h"
 #include "SparseMatrix.h"
 
diff --git a/OndselSolver/GESpMatFullPvPosIC.cpp b/OndselSolver/GESpMatFullPvPosIC.cpp
index 458e1da..9336de4 100644
--- a/OndselSolver/GESpMatFullPvPosIC.cpp
+++ b/OndselSolver/GESpMatFullPvPosIC.cpp
@@ -8,6 +8,7 @@
  
 #include <algorithm>
 #include <cassert>
+#include <cstdint>
 
 #include "GESpMatFullPvPosIC.h"
 #include "SingularMatrixError.h"
diff --git a/OndselSolver/GeneralSpline.h b/OndselSolver/GeneralSpline.h
index eab2f0c..2fcce7c 100644
--- a/OndselSolver/GeneralSpline.h
+++ b/OndselSolver/GeneralSpline.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "AnyGeneralSpline.h"
 
 namespace MbD {
diff --git a/OndselSolver/NewtonRaphson.cpp b/OndselSolver/NewtonRaphson.cpp
index 806544f..6da502d 100644
--- a/OndselSolver/NewtonRaphson.cpp
+++ b/OndselSolver/NewtonRaphson.cpp
@@ -9,6 +9,7 @@
 #include <iostream>
 #include <limits>
 #include <cassert>
+#include <cstdint>
 
 #include "NewtonRaphson.h"
 #include "SystemSolver.h"
diff --git a/OndselSolver/NewtonRaphson.h b/OndselSolver/NewtonRaphson.h
index 9d9fb19..bf0c517 100644
--- a/OndselSolver/NewtonRaphson.h
+++ b/OndselSolver/NewtonRaphson.h
@@ -8,6 +8,7 @@
  
 #pragma once
 
+#include <cstdint>
 #include <memory>
 #include <vector>
 
diff --git a/OndselSolver/Part.h b/OndselSolver/Part.h
index 610ef7a..57a884d 100644
--- a/OndselSolver/Part.h
+++ b/OndselSolver/Part.h
@@ -8,6 +8,7 @@
  
 #pragma once
 
+#include <cstdint>
 #include <memory>
 
 #include "Item.h"
diff --git a/OndselSolver/PartFrame.cpp b/OndselSolver/PartFrame.cpp
index a641604..5219bb8 100644
--- a/OndselSolver/PartFrame.cpp
+++ b/OndselSolver/PartFrame.cpp
@@ -7,6 +7,7 @@
  ***************************************************************************/
  
 #include<algorithm>
+#include <cstdint>
 
 #include "PartFrame.h"
 #include "Part.h"
diff --git a/OndselSolver/PartFrame.h b/OndselSolver/PartFrame.h
index 12c41ab..8d25461 100644
--- a/OndselSolver/PartFrame.h
+++ b/OndselSolver/PartFrame.h
@@ -8,6 +8,7 @@
  
 #pragma once
 
+#include <cstdint>
 #include <memory>
 #include <vector>
 #include <functional>
diff --git a/OndselSolver/RackPinConstraintIqcJqc.h b/OndselSolver/RackPinConstraintIqcJqc.h
index 1f50f4a..1a6e7b6 100644
--- a/OndselSolver/RackPinConstraintIqcJqc.h
+++ b/OndselSolver/RackPinConstraintIqcJqc.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "RackPinConstraintIqcJc.h"
 
 namespace MbD {
diff --git a/OndselSolver/ScrewConstraintIqcJqc.h b/OndselSolver/ScrewConstraintIqcJqc.h
index 812d37a..a6fd708 100644
--- a/OndselSolver/ScrewConstraintIqcJqc.h
+++ b/OndselSolver/ScrewConstraintIqcJqc.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "ScrewConstraintIqcJc.h"
 
 namespace MbD {
diff --git a/OndselSolver/TranslationConstraintIqcJqc.h b/OndselSolver/TranslationConstraintIqcJqc.h
index ed0eb9a..78fde6e 100644
--- a/OndselSolver/TranslationConstraintIqcJqc.h
+++ b/OndselSolver/TranslationConstraintIqcJqc.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "TranslationConstraintIqcJc.h"
 
 namespace MbD {
diff --git a/OndselSolver/VectorNewtonRaphson.h b/OndselSolver/VectorNewtonRaphson.h
index d3eb6ce..89adaaa 100644
--- a/OndselSolver/VectorNewtonRaphson.h
+++ b/OndselSolver/VectorNewtonRaphson.h
@@ -8,6 +8,7 @@
  
 #pragma once
 
+#include <cstdint>
 #include <limits>
 
 #include "NewtonRaphson.h"
diff --git a/OndselSolver/VelICSolver.h b/OndselSolver/VelICSolver.h
index 15bef39..168704e 100644
--- a/OndselSolver/VelICSolver.h
+++ b/OndselSolver/VelICSolver.h
@@ -8,6 +8,8 @@
  
 #pragma once
 
+#include <cstdint>
+
 #include "VelSolver.h"
 
 namespace MbD {
diff --git a/OndselSolver/VelSolver.h b/OndselSolver/VelSolver.h
index 4824801..af3bb5b 100644
--- a/OndselSolver/VelSolver.h
+++ b/OndselSolver/VelSolver.h
@@ -8,6 +8,7 @@
  
 #pragma once
 
+#include <cstdint>
 #include <memory>
 
 #include "Solver.h"