diff --git a/Jellyfin.Plugin.SmartPlaylist/Lisp/Interpreter.cs b/Jellyfin.Plugin.SmartPlaylist/Lisp/Interpreter.cs
index 5ca8df6..7027c09 100644
--- a/Jellyfin.Plugin.SmartPlaylist/Lisp/Interpreter.cs
+++ b/Jellyfin.Plugin.SmartPlaylist/Lisp/Interpreter.cs
@@ -503,6 +503,9 @@ namespace Jellyfin.Plugin.SmartPlaylist.Lisp {
             switch (expression) {
                 case Symbol s:
                     if (_environment.Find(s.Name()) is not IEnvironment<string, Expression> env) {
+                        if (builtins.ContainsKey(s.Name()) || builtinsLater.ContainsKey(s.Name())) {
+                            return s;
+                        }
                         throw new ApplicationException($"Could not find '{s.Name()}'");
                     }
                     var r_ = env.Get(s.Name());
diff --git a/Tests/Tests.cs b/Tests/Tests.cs
index 3f358d1..1b4714d 100644
--- a/Tests/Tests.cs
+++ b/Tests/Tests.cs
@@ -258,6 +258,7 @@ namespace Tests
             //Assert.Equal("", e.eval("(rand)").ToString());
             //Assert.Equal("", e.eval("(shuf (list 0 1 2 3 4 5 6))").ToString());
             Assert.Equal("(1 2 3 4 5 6 7)", e.eval("(qsort (lambda (a b) (> a b)) '(5 4 7 3 2 6 1))").ToString());
+            Assert.Equal("(1 2 3 4 5 6 7)", e.eval("(qsort > (list 5 4 7 3 2 6 1))").ToString());
         }
     }
 }