diff --git a/ChangeLog b/ChangeLog
index 421218ac..35de41d6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Dec 23 15:43:59 CET 2002 Daniel Veillard <daniel@veillard.com>
+
+	* python/libxslt.c: patch from Stéphane Bidoul for Python 2.1
+
 Sun Dec 22 22:54:04 CET 2002 Daniel Veillard <daniel@veillard.com>
 
 	* vms/build_xslt.com libxslt/xsltconfig.h.in libxslt/xsltutils.c:
diff --git a/python/libxslt.c b/python/libxslt.c
index fed2d1c8..1e517913 100644
--- a/python/libxslt.c
+++ b/python/libxslt.c
@@ -19,6 +19,9 @@
 #include "libxslt_wrap.h"
 #include "libxslt-py.h"
 
+#if (defined(_MSC_VER) || defined(__MINGW32__)) && !defined(vsnprintf)
+#define vsnprintf(b,c,f,a) _vsnprintf(b,c,f,a)
+#endif
 
 /* #define DEBUG */
 /* #define DEBUG_XPATH */