diff --git a/Jellyfin.Plugin.SmartPlaylist/Lisp/Interpreter.cs b/Jellyfin.Plugin.SmartPlaylist/Lisp/Interpreter.cs
index 6d09b4a..76d0fbf 100644
--- a/Jellyfin.Plugin.SmartPlaylist/Lisp/Interpreter.cs
+++ b/Jellyfin.Plugin.SmartPlaylist/Lisp/Interpreter.cs
@@ -112,6 +112,7 @@ namespace Jellyfin.Plugin.SmartPlaylist.Lisp {
             this["<="] = _le;
             this["eq?"] = _eq;
             this["="] = _eq;
+            this["!="] = _ne;
             this["abs"] = _abs;
             this["append"] = _append;
             this["begin"] = _begin;
@@ -123,7 +124,6 @@ namespace Jellyfin.Plugin.SmartPlaylist.Lisp {
             this["haskeys"] = _haskeys;
             this["getitems"] = _getitems;
             this["invoke"] = _invoke;
-            //this[new Symbol("!=")] = _ne;
         }
 
         private static T _agg<T>(Func<T, T, T> op, IList<T> args) {