diff --git a/src/block.rs b/src/block.rs
index fa8efb3..7dc40ec 100644
--- a/src/block.rs
+++ b/src/block.rs
@@ -211,7 +211,7 @@ impl<'s> TreeParser<'s> {
                             if let tree::Element::Container(Node::Container(Container::List {
                                 tight,
                                 ..
-                            })) = self.tree.elem_mut(*node)
+                            })) = self.tree.elem(*node)
                             {
                                 *tight = false;
                             } else {
diff --git a/src/tree.rs b/src/tree.rs
index ddd00a5..3266570 100644
--- a/src/tree.rs
+++ b/src/tree.rs
@@ -210,7 +210,7 @@ impl<C: Clone, A: Clone> Builder<C, A> {
         self.depth
     }
 
-    pub(super) fn elem_mut(&mut self, ni: NodeIndex) -> Element<C, A> {
+    pub(super) fn elem(&mut self, ni: NodeIndex) -> Element<C, A> {
         match &mut self.nodes[ni.index()].kind {
             NodeKind::Root => unreachable!(),
             NodeKind::Container(c, ..) => Element::Container(c),