diff --git a/src/localize.c b/src/localize.c
index ab2b416..8744458 100755
--- a/src/localize.c
+++ b/src/localize.c
@@ -1028,6 +1028,8 @@ static void messagePos( TidyDocImpl* doc, TidyReportLevel level,
 
     if ( go )
     {
+		va_list args_copy;
+		va_copy(args_copy, args);
         TY_(tmbvsnprintf)(messageBuf, sizeMessageBuf, msg, args);
         if ( doc->mssgFilt )
         {
@@ -1037,7 +1039,7 @@ static void messagePos( TidyDocImpl* doc, TidyReportLevel level,
         if ( doc->mssgFilt2 )
         {
             TidyDoc tdoc = tidyImplToDoc( doc );
-            go = doc->mssgFilt2( tdoc, level, line, col, msg, args );
+            go = doc->mssgFilt2( tdoc, level, line, col, msg, args_copy );
         }
     }