diff --git a/ms/uplink.c b/ms/uplink.c
index 7b7da08d47..6d59cb1f87 100644
--- a/ms/uplink.c
+++ b/ms/uplink.c
@@ -40,7 +40,8 @@ void OPENSSL_Uplink (volatile void **table, int index)
      * should be sufficient [it prohibits compiler to reorder memory
      * access instructions]. */
     do {
-	len = _stprintf (msg,_T("OPENSSL_Uplink(%p,%02X): "),table,index);
+	len = _sntprintf (msg,sizeof(msg)/sizeof(TCHAR),
+			  _T("OPENSSL_Uplink(%p,%02X): "),table,index);
 	_tcscpy (msg+len,_T("unimplemented function"));
 
 	if ((h=apphandle)==NULL)