diff --git a/graphicle/select.py b/graphicle/select.py
index 1d21292..77868da 100644
--- a/graphicle/select.py
+++ b/graphicle/select.py
@@ -125,9 +125,10 @@ def fastjet_clusters(
     sequence = fastjet.ClusterSequence(pmu_ak, jetdef)
     jets = sequence.inclusive_jets()
     jet_pmus = gcl.MomentumArray(jets.to_numpy())
+    num_jets = len(jet_pmus)
     pt_descend_idxs = np.argsort(jet_pmus.pt)[::-1].tolist()
     jet_pmus = jet_pmus[pt_descend_idxs]
-    cuts = np.ones(len(pt_descend_idxs), dtype=np.bool_)
+    cuts = np.ones(num_jets, dtype=np.bool_)
     if pt_cut is not None:
         cuts = jet_pmus.pt > pt_cut
     if eta_cut is not None: