diff --git a/contrib/slideshowMusic.lua b/contrib/slideshowMusic.lua
index 9a41021..564e84d 100644
--- a/contrib/slideshowMusic.lua
+++ b/contrib/slideshowMusic.lua
@@ -24,7 +24,7 @@ USAGE
 * require this script from your main lua file
 ]]
    
-dt = require "darktable"
+local dt = require "darktable"
 dt.configuration.check_version(...,{2,0,1})
 
 local function playSlideshowMusic(_, old_view, new_view)