diff --git a/include/stdex/unicode.hpp b/include/stdex/unicode.hpp
index abd63e33f..c92f836cf 100644
--- a/include/stdex/unicode.hpp
+++ b/include/stdex/unicode.hpp
@@ -181,7 +181,7 @@ namespace stdex
 				return;
 
 #ifdef _WIN32
-			constexpr DWORD dwFlagsMBWC = MB_PRECOMPOSED;
+			DWORD dwFlagsMBWC = static_cast<UINT>(m_from_wincp) < CP_UTF7 ? MB_PRECOMPOSED : 0;
 			constexpr DWORD dwFlagsWCMB = 0;
 			constexpr LPCCH lpDefaultChar = NULL;