diff --git a/puppetparser/model.py b/puppetparser/model.py
index 48ab653..9dfe142 100644
--- a/puppetparser/model.py
+++ b/puppetparser/model.py
@@ -206,7 +206,7 @@ def __init__(
         operator: str,
     ):
         super().__init__(line, col, end_line, end_col)
-        self.arguments: Tuple[CodeElement, ...] = arguments
+        self.arguments: List[CodeElement] = list(arguments)
         self.operator: str = operator
 
 
diff --git a/pyproject.toml b/pyproject.toml
index ebad63c..9baa446 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "puppetparser"
-version = "0.2.6"
+version = "0.2.7"
 description = "A parser from Puppet to an object model"
 authors = ["Nuno Saavedra <nuno.saavedra@tecnico.ulisboa.pt>"]
 license = "GPL-3.0"