diff --git a/DDSView/ddsview.cpp b/DDSView/ddsview.cpp
index 7c84424..5105182 100644
--- a/DDSView/ddsview.cpp
+++ b/DDSView/ddsview.cpp
@@ -14,6 +14,7 @@
 #include <algorithm>
 #include <cassert>
 #include <cstdio>
+#include <cwchar>
 
 #include <dxgiformat.h>
 #include <d3d11_1.h>
diff --git a/Texassemble/texassemble.cpp b/Texassemble/texassemble.cpp
index daa4df3..7a6e0b3 100644
--- a/Texassemble/texassemble.cpp
+++ b/Texassemble/texassemble.cpp
@@ -24,6 +24,7 @@
 #include <cstddef>
 #include <cstdio>
 #include <cstdlib>
+#include <cwchar>
 #include <fstream>
 #include <iterator>
 #include <memory>
diff --git a/Texconv/texconv.cpp b/Texconv/texconv.cpp
index 2c6aedf..9aca51f 100644
--- a/Texconv/texconv.cpp
+++ b/Texconv/texconv.cpp
@@ -24,6 +24,7 @@
 #include <cstddef>
 #include <cstdio>
 #include <cstdlib>
+#include <cwchar>
 #include <fstream>
 #include <iterator>
 #include <memory>
diff --git a/Texdiag/texdiag.cpp b/Texdiag/texdiag.cpp
index 904fc95..93d4997 100644
--- a/Texdiag/texdiag.cpp
+++ b/Texdiag/texdiag.cpp
@@ -25,6 +25,7 @@
 #include <cstddef>
 #include <cstdio>
 #include <cstdlib>
+#include <cwchar>
 #include <fstream>
 #include <iterator>
 #include <memory>