diff --git a/src/node.rs b/src/node.rs
index a229f66..d11ce3c 100644
--- a/src/node.rs
+++ b/src/node.rs
@@ -7,7 +7,7 @@ use crate::Org;
 pub struct HeadlineNode(pub(crate) NodeId);
 
 impl HeadlineNode {
-    pub fn get_title<'a>(self, org: &'a Org<'a>) -> &'a Title<'a> {
+    pub fn get_title<'a: 'b, 'b>(self, org: &'b Org<'a>) -> &'b Title<'a> {
         let title_node = org.arena[self.0].first_child().unwrap();
         if let Element::Title(title) = org.arena[title_node].get() {
             title
@@ -16,7 +16,7 @@ impl HeadlineNode {
         }
     }
 
-    pub fn get_title_mut<'a>(self, org: &'a mut Org<'a>) -> &'a mut Title<'a> {
+    pub fn get_title_mut<'a: 'b, 'b>(self, org: &'b mut Org<'a>) -> &'b mut Title<'a> {
         let title_node = org.arena[self.0].first_child().unwrap();
         if let Element::Title(title) = org.arena[title_node].get_mut() {
             title