diff --git a/reactos/dll/win32/riched20/writer.c b/reactos/dll/win32/riched20/writer.c
index c8d1226c894..3054e2fec9e 100644
--- a/reactos/dll/win32/riched20/writer.c
+++ b/reactos/dll/win32/riched20/writer.c
@@ -116,7 +116,7 @@ ME_StreamOutPrint(ME_TextEditor *editor, const char *format, ...)
   va_list valist;
 
   va_start(valist, format);
-  len = vsnprintf(string, sizeof(string), format, valist);
+  len = _vsnprintf(string, sizeof(string), format, valist);
   va_end(valist);
   
   return ME_StreamOutMove(editor, string, len);
diff --git a/reactos/include/reactos/wine/unicode.h b/reactos/include/reactos/wine/unicode.h
index 97b417a7f23..d65876d5d6e 100644
--- a/reactos/include/reactos/wine/unicode.h
+++ b/reactos/include/reactos/wine/unicode.h
@@ -37,7 +37,7 @@
 #define sprintfW swprintf
 #define vsprintfW vswprintf
 #define snprintfW _snwprintf
-#define vsnprintfW vsnwprintf
+#define vsnprintfW _vsnwprintf
 
 #ifndef WINE_UNICODE_API
 #define WINE_UNICODE_API __attribute__((dllimport))