diff --git a/DirectXMesh/DirectXMeshP.h b/DirectXMesh/DirectXMeshP.h
index 44cadd9..282928e 100644
--- a/DirectXMesh/DirectXMeshP.h
+++ b/DirectXMesh/DirectXMeshP.h
@@ -99,6 +99,7 @@
 #include <cmath>
 #include <cstdlib>
 #include <cstring>
+#include <cwchar>
 #include <map>
 #include <string>
 #include <unordered_map>
diff --git a/Meshconvert/Mesh.cpp b/Meshconvert/Mesh.cpp
index debbbb8..98e80e9 100644
--- a/Meshconvert/Mesh.cpp
+++ b/Meshconvert/Mesh.cpp
@@ -24,6 +24,7 @@
 #include "Mesh.h"
 
 #include <cstring>
+#include <cwchar>
 #include <iterator>
 #include <utility>
 
diff --git a/Meshconvert/MeshOBJ.cpp b/Meshconvert/MeshOBJ.cpp
index 8b69708..565d15b 100644
--- a/Meshconvert/MeshOBJ.cpp
+++ b/Meshconvert/MeshOBJ.cpp
@@ -25,6 +25,7 @@
 #include "WaveFrontReader.h"
 
 #include <iterator>
+#include <cwchar>
 
 using namespace DirectX;
 
diff --git a/Meshconvert/Meshconvert.cpp b/Meshconvert/Meshconvert.cpp
index 02b91d3..b4733f4 100644
--- a/Meshconvert/Meshconvert.cpp
+++ b/Meshconvert/Meshconvert.cpp
@@ -24,6 +24,7 @@
 #include <cstddef>
 #include <cstdio>
 #include <cstdlib>
+#include <cwchar>
 #include <fstream>
 #include <iterator>
 #include <memory>