--- a/libjs/jsprf.c	2006-09-22 21:29:14.000000000 +0200
+++ b/libjs/jsprf.c	2010-09-30 23:31:12.000000000 +0200
@@ -641,7 +641,7 @@ static struct NumArgState* BuildArgArray
             continue;
         }
 
-        VARARGS_ASSIGN(nas[cn].ap, ap);
+        va_copy(nas[cn].ap, ap);
 
         switch( nas[cn].type ){
         case TYPE_INT16: