diff --git a/src/hugr/hugrmut.rs b/src/hugr/hugrmut.rs
index 2baca50af..360011bb5 100644
--- a/src/hugr/hugrmut.rs
+++ b/src/hugr/hugrmut.rs
@@ -65,15 +65,6 @@ pub trait HugrMut: HugrMutInternals {
         self.hugr_mut().add_op_before(sibling, op)
     }
 
-    /// A generalisation of [`HugrMut::add_op_before`], needed temporarily until
-    /// add_op type methods all default to creating nodes with open extensions.
-    /// See issue #424
-    #[inline]
-    fn add_node_before(&mut self, sibling: Node, nodetype: NodeType) -> Result<Node, HugrError> {
-        self.valid_non_root(sibling)?;
-        self.hugr_mut().add_node_before(sibling, nodetype)
-    }
-
     /// Add a node to the graph as the next sibling of another node.
     ///
     /// The sibling node's parent becomes the new node's parent.
@@ -215,11 +206,7 @@ impl<T: RootTagged<RootHandle = Node> + AsMut<Hugr>> HugrMut for T {
     }
 
     fn add_op_before(&mut self, sibling: Node, op: impl Into<OpType>) -> Result<Node, HugrError> {
-        self.add_node_before(sibling, NodeType::open_extensions(op))
-    }
-
-    fn add_node_before(&mut self, sibling: Node, nodetype: NodeType) -> Result<Node, HugrError> {
-        let node = self.as_mut().add_node(nodetype);
+        let node = self.as_mut().add_node(NodeType::open_extensions(op));
         self.as_mut()
             .hierarchy
             .insert_before(node.index, sibling.index)?;