diff --git a/mingw-w64-crt/stdio/vsnwprintf.c b/mingw-w64-crt/stdio/vsnwprintf.c
index 2cdfc08..33a7e2b 100644
--- a/mingw-w64-crt/stdio/vsnwprintf.c
+++ b/mingw-w64-crt/stdio/vsnwprintf.c
@@ -7,7 +7,7 @@
 #include <stdarg.h>
 #include <wchar.h>
 
-int  vsnwprintf(wchar_t *buffer,  size_t n, const wchar_t * format, va_list argptr)
+int  __cdecl vsnwprintf(wchar_t *buffer,  size_t n, const wchar_t * format, va_list argptr)
 {
     return _vsnwprintf(buffer, n, format, argptr);
 }