diff --git a/src/qiskit_qec/operators/pauli.py b/src/qiskit_qec/operators/pauli.py
index e6711524..93f4058e 100644
--- a/src/qiskit_qec/operators/pauli.py
+++ b/src/qiskit_qec/operators/pauli.py
@@ -519,6 +519,8 @@ def to_instruction(self):
             syntax=pauli_rep.PRODUCT_SYNTAX,
             qubit_order="right-to-left",
         )
+        if isinstance(phase_exp, np.ndarray):
+            phase_exp = phase_exp[0]
 
         if len(pauli) == 1:
             gate = {"I": IGate(), "X": XGate(), "Y": YGate(),