diff --git a/sc2ts/utils.py b/sc2ts/utils.py
index 09dcd71..c5b47be 100644
--- a/sc2ts/utils.py
+++ b/sc2ts/utils.py
@@ -390,7 +390,7 @@ def _node_summary(self, u, child_mutations=True):
             "pango": pango,
             "parents": np.sum(self.ts.edges_child == u),
             "children": np.sum(self.ts.edges_parent == u),
-            "descendants": self.nodes_max_descendant_samples[u] - 1,
+            "descendants": self.nodes_max_descendant_samples[u],
             "date": self.nodes_date[u],
             "delay": self.nodes_submission_delay[u],
             "qc": qc,