diff --git a/apps/plugins/lua/rocklib_aux.pl b/apps/plugins/lua/rocklib_aux.pl
index 9103fccbda..8256b838ed 100755
--- a/apps/plugins/lua/rocklib_aux.pl
+++ b/apps/plugins/lua/rocklib_aux.pl
@@ -51,17 +51,25 @@ my @ported_functions;
 # you want to manually port them to Lua. The format is a standard Perl regular
 # expression.
 my @forbidden_functions = ('^open$',
+                           '^open_utf8$',
                            '^close$',
                            '^read$',
                            '^write$',
                            '^mkdir$',
                            '^rmdir$',
+                           '^remove$',
+                           '^rename$',
                            '^lseek$',
                            '^ftruncate$',
                            '^filesize$',
                            '^fdprintf$',
                            '^read_line$',
                            '^[a-z]+dir$',
+                           '^s?+rand$',
+                           '^strl?+cpy$',
+                           '^strl?+cat$',
+                           '^codec_',
+                           '^timer_',
                            '^__.+$',
                            '^.+_(un)?cached$',
                            '^audio_play$',