diff --git a/source/charset.cpp b/source/charset.cpp
index d5e1edda..573e1e91 100644
--- a/source/charset.cpp
+++ b/source/charset.cpp
@@ -1156,10 +1156,10 @@ namespace nana
 					switch(encoding)
 					{
 					case unicode::utf8:
-						return utf32_to_utf8(wcstr);
-					case unicode::utf16:
-						return utf32_to_utf16(wcstr);
+						return utf16_to_utf8(wcstr);
 					case unicode::utf32:
+						return utf16_to_utf32(wcstr);
+					case unicode::utf16:
 						return wcstr;
 					}
 				}