diff --git a/videoclip.lua b/videoclip.lua
index e880845..cc66e27 100644
--- a/videoclip.lua
+++ b/videoclip.lua
@@ -31,7 +31,7 @@ local encoder
 local OSD
 local Timings
 
-local presets = {
+local allowed_presets = {
     ultrafast = true,
     superfast = true,
     veryfast = true,
@@ -346,7 +346,7 @@ if not config.audio_bitrate:endswith('k') then
     config.audio_bitrate = config.audio_bitrate .. 'k'
 end
 
-if not presets[config.preset] then
+if not allowed_presets[config.preset] then
     config.preset = 'faster'
 end