diff --git a/qse/samples/awk/awk22.cpp b/qse/samples/awk/awk22.cpp
index a8285b54..79a69bf1 100644
--- a/qse/samples/awk/awk22.cpp
+++ b/qse/samples/awk/awk22.cpp
@@ -2,7 +2,9 @@
 #include <qse/si/sio.h>
 #include <string>
 
-#if defined(QSE_CHAR_IS_WCHAR)
+#if defined(QSE_CHAR_IS_WCHAR) && defined(QSE_WCHAR_IS_CHAR16_T)
+typedef std::basic_string<char16_t> String;
+#elif defined(QSE_CHAR_IS_WCHAR)
 typedef std::wstring String;
 #else
 typedef std::string String;
diff --git a/qse/samples/awk/awk23.cpp b/qse/samples/awk/awk23.cpp
index fa0340cc..45e4f15f 100644
--- a/qse/samples/awk/awk23.cpp
+++ b/qse/samples/awk/awk23.cpp
@@ -2,7 +2,9 @@
 #include <qse/si/sio.h>
 #include <string>
 
-#if defined(QSE_CHAR_IS_WCHAR)
+#if defined(QSE_CHAR_IS_WCHAR) && defined(QSE_WCHAR_IS_CHAR16_T)
+typedef std::basic_string<char16_t> String;
+#elif defined(QSE_CHAR_IS_WCHAR)
 typedef std::wstring String;
 #else
 typedef std::string String;
diff --git a/qse/samples/awk/awk28.cpp b/qse/samples/awk/awk28.cpp
index e308b78e..44d8a2f1 100644
--- a/qse/samples/awk/awk28.cpp
+++ b/qse/samples/awk/awk28.cpp
@@ -36,7 +36,9 @@
 #endif
 
 #include <string>
-#if defined(QSE_CHAR_IS_WCHAR)
+#if defined(QSE_CHAR_IS_WCHAR) && defined(QSE_WCHAR_IS_CHAR16_T)
+typedef std::basic_string<char16_t> String;
+#elif defined(QSE_CHAR_IS_WCHAR)
 typedef std::wstring String;
 #else
 typedef std::string String;