diff --git a/library/debug.c b/library/debug.c
index 4752ab1..afa21cb 100644
--- a/library/debug.c
+++ b/library/debug.c
@@ -90,7 +90,7 @@
 
     va_start( argp, format );
 #if defined(_WIN32)
-#if defined(_TRUNCATE)
+#if defined(_TRUNCATE) && !defined(__MINGW32__)
     ret = _vsnprintf_s( str, DEBUG_BUF_SIZE, _TRUNCATE, format, argp );
 #else
     ret = _vsnprintf( str, DEBUG_BUF_SIZE, format, argp );