diff --git a/python/ffsim/qiskit/jordan_wigner.py b/python/ffsim/qiskit/jordan_wigner.py
index ba897adbe..3b1f13169 100644
--- a/python/ffsim/qiskit/jordan_wigner.py
+++ b/python/ffsim/qiskit/jordan_wigner.py
@@ -62,7 +62,7 @@ def jordan_wigner(op: FermionOperator, n_qubits: int | None = None) -> SparsePau
             qubit_op @= _qubit_action(action, orb + spin * norb, n_qubits)
         qubit_terms.append(qubit_op)
 
-    return SparsePauliOp.sum(qubit_terms)
+    return SparsePauliOp.sum(qubit_terms).simplify()
 
 
 @functools.cache