diff --git a/src/hugr.rs b/src/hugr.rs
index ec44afa46..322a123c6 100644
--- a/src/hugr.rs
+++ b/src/hugr.rs
@@ -305,8 +305,7 @@ impl Hugr {
 
     /// Add a node to the graph, with the default conversion from OpType to NodeType
     pub(crate) fn add_op(&mut self, op: impl Into<OpType>) -> Node {
-        // TODO: Default to `NodeType::open_extensions` once we can infer extensions
-        self.add_node(NodeType::pure(op))
+        self.add_node(NodeType::open_extensions(op))
     }
 
     /// Add a node to the graph.
diff --git a/src/hugr/hugrmut.rs b/src/hugr/hugrmut.rs
index b70d99be8..5f6c46bc8 100644
--- a/src/hugr/hugrmut.rs
+++ b/src/hugr/hugrmut.rs
@@ -207,7 +207,7 @@ 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> {
-        let node = self.as_mut().add_node(NodeType::open_extensions(op));
+        let node = self.as_mut().add_op(op);
         self.as_mut()
             .hierarchy
             .insert_before(node.index, sibling.index)?;